cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.48370/ofd/uq9bnm
title: Sorex araneus - 22417, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-06-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/yumr79
title: Sorex araneus - 66026, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-10-08, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/rfgiih
title: Sorex araneus - 32156, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-07-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/sav4pt
title: Sorex araneus - 31622, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-05-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xq2snb
title: Sorex araneus - 110680, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-08-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/eavx2g
title: Sorex araneus - 2843, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-08-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/9brz9f
title: Sorex araneus - 159970, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1990-07-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/lso9jh
title: Sorex araneus - 72526, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-04-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/rhwqmo
title: Sorex araneus - 113475, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1974-07-12, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wkrgid
title: Sorex araneus - 74561, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-06-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/y4fkgt
title: Sorex araneus - 34690, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1964-01-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/tppica
title: Sorex araneus - 75934, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-07-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/fxyola
title: Sorex araneus - 117637, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1975-10-13, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/zh0yaa
title: Sorex araneus - 4141, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-03-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/poexzn
title: Sorex araneus - 135404, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1979-11-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/58fprf
title: Sorex araneus - 34500, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1964-01-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/8yhzhi
title: Sorex araneus - 3237, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-08-22, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/3fsuua
title: Sorex araneus - 8560, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-06-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ehmzmc
title: Sorex araneus - 1143, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-06-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/gvngtn
title: Sorex araneus - 97964, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-06-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/qsex24
title: Sorex araneus - 169245, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 2004-07-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/tup6hj
title: Sorex araneus - 16638, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1956-03-28, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/6fwdyj
title: Sorex araneus - 33583, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-09-21, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/bsqhy3
title: Sorex araneus - 158293, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1989-07-12, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/t236yv
title: Sorex araneus - 33719, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-10-04, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/drb9f3
title: Sorex araneus - 8931, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-06-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/v4urte
title: Sorex araneus - 83514, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-10-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/3gd46j
title: Sorex araneus - 2110, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-07-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/vcao8l
title: Sorex araneus - 22213, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-06-12, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/p5dc6g
title: Sorex araneus - 104925, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-06-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/e3dzkx
title: Sorex araneus - 13597, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/o2lzpk
title: Sorex araneus - 19682, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1958-01-09, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/qknvob
title: Sorex araneus - 12993, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-08-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/dnvmie
title: Sorex araneus - 76046, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-07-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/kggnwv
title: Sorex araneus - 22899, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-08-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/fyiwim
title: Sorex araneus - 107104, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-08-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/w8xfvz
title: Sorex araneus - 18433, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-07-09, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/e6azdy
title: Sorex araneus - 113441, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1974-07-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/rz3siw
title: Sorex araneus - 5854, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-08-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/vri7wd
title: Sorex araneus - 14110, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/gkzrkf
title: Sorex araneus - 22042, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-06-04, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/rk7iib
title: Sorex araneus - 158650, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1989-10-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/lam99j
title: Sorex araneus - 110389, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-07-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ven5i9
title: Sorex araneus - 13379, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/yctf2y
title: Sorex araneus - 51425, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1966-03-22, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/rvxxye
title: Sorex araneus - 106577, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-07-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/8tl0rg
title: Sorex araneus - 110958, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-09-25, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/szebcv
title: Sorex araneus - 105027, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-06-09, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/bt87l9
title: Sorex araneus - 16345, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1956-01-17, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/fhruvg
title: Sorex araneus - 12906, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-08-24, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/pm9kd8
title: Sorex araneus - 2645, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-07-28, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/vl2nxv
title: Sorex araneus - 14810, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-25, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/usn4on
title: Sorex araneus - 12185, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-08-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/iloqya
title: Sorex araneus - 150836, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1985-07-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/iv4psm
title: Sorex araneus - 116552, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1975-07-17, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ifqmg9
title: Sorex araneus - 79403, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-09-04, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/1qeoqq
title: Sorex araneus - 10709, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-07-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/t7uidt
title: Sorex araneus - 107068, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-08-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/x8ktup
title: Sorex araneus - 94959, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1970-10-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ejrirw
title: Sorex araneus - 20078, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1958-07-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/uenzkt
title: Sorex araneus - 6889, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-10-04, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/mrtawa
title: Sorex araneus - 98505, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-07-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ptl9pi
title: Sorex araneus - 163789, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1995-07-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/jpalxo
title: Sorex araneus - 18605, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-07-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xral0m
title: Sorex araneus - 105188, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-06-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/bqcxac
title: Sorex araneus - 76263, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-07-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/cbbadm
title: Sorex araneus - 141752, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1982-07-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/vuxc0g
title: Sorex araneus - 4990, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/0sbrdv
title: Sorex araneus - 26447, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-11-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/5dwgxa
title: Sorex araneus - 9561, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-06-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/yebvkc
title: Sorex araneus - 6616, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-09-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/hcvhhq
title: Sorex araneus - 169330, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 2004-09-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/vu97jk
title: Sorex araneus - 3648, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-09-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/vqjhto
title: Sorex araneus - 20795, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-02-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/lsnvfl
title: Sorex araneus - 11278, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-07-21, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/nekgcf
title: Sorex araneus - 1520, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-06-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/umihem
title: Sorex araneus - 115207, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1974-09-13, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ypad84
title: Sorex araneus - 6087, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-08-17, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/qkjgcf
title: Sorex araneus - 8751, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-06-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/pmwih8
title: Sorex araneus - 74549, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-06-17, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/q33dny
title: Sorex araneus - 9867, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-07-04, in: Białowieża National Park, Poland. Material type: