cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.48370/ofd/xztlrt
title: Sorex araneus - 25218, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-07-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/7m8o6b
title: Sorex araneus - 106920, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-07-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ugpxjy
title: Sorex araneus - 34526, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1964-01-12, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/kdiv4p
title: Sorex araneus - 72522, 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/bwetgm
title: Sorex araneus - 5072, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-09, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/am6eyj
title: Sorex araneus - 1809, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-06-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/lpzvrx
title: Sorex araneus - 98177, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-07-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/zrux5h
title: Sorex araneus - 14783, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-24, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/hdajiv
title: Sorex araneus - 1907, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-06-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xox2fr
title: Sorex araneus - 28887, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-08-25, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/mrtiq8
title: Sorex araneus - 19419, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-12-12, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/0cbkqg
title: Sorex araneus - 5108, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/l3lr3z
title: Sorex araneus - 2936, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-08-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/te5uxw
title: Sorex araneus - 106342, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-07-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/t4yrmn
title: Sorex araneus - 62241, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-03-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ogg4jc
title: Sorex araneus - 65347, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-09-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/aynqsz
title: Sorex araneus - 97524, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-04-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/abounw
title: Sorex araneus - 162980, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1993-09-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ten32g
title: Sorex araneus - 4277, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-04-09, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/3fascj
title: Sorex araneus - 29038, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-09-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/9wlrpu
title: Sorex araneus - 15243, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-10-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/sfn5fu
title: Sorex araneus - 32845, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-08-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/inetzg
title: Sorex araneus - 1156, 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/draqej
title: Sorex araneus - 115811, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1974-11-21, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/oo19fs
title: Sorex araneus - 114284, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1974-08-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/yhyzf8
title: Sorex araneus - 966, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-05-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wskdia
title: Sorex araneus - 13315, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/vl6vkw
title: Sorex araneus - 6002, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-08-12, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/oojpdx
title: Sorex araneus - 2704, 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/icjb5w
title: Sorex araneus - 8885, 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/klax5w
title: Sorex araneus - 104335, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-02-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/9nicfc
title: Sorex araneus - 98831, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-08-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/uu3pkh
title: Sorex araneus - 3954, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-11-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/2lsqmq
title: Sorex araneus - 97828, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-06-18, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ndlifn
title: Sorex araneus - 14026, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-13, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/shwdb2
title: Sorex araneus - 32232, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-07-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/oolxzr
title: Sorex araneus - 24787, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-06-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/oq9pps
title: Sorex araneus - 104426, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-04-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/yuovw8
title: Sorex araneus - 14172, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ay0e03
title: Sorex araneus - 111180, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-10-12, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/3xza5b
title: Sorex araneus - 33647, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-09-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/tyhobg
title: Sorex araneus - 159937, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1990-07-25, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wwlivp
title: Sorex araneus - 52124, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1966-06-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/cbywiu
title: Sorex araneus - 110533, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-07-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wzjyro
title: Sorex araneus - 64174, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-07-25, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/kbp0ze
title: Sorex araneus - 3548, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-09-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/hsgwme
title: Sorex araneus - 32237, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-07-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/dgdnsf
title: Sorex araneus - 32973, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-08-28, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/zo8jrd
title: Sorex araneus - 4584, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-06-12, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/uat09b
title: Sorex araneus - 98652, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-07-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/46hks1
title: Sorex araneus - 152090, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1985-10-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/amgd0e
title: Sorex araneus - 16159, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-11-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wgao4l
title: Sorex araneus - 55347, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1966-11-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ipnxtl
title: Sorex araneus - 105028, 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/tgkprd
title: Sorex araneus - 4545, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-06-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wg0ucc
title: Sorex araneus - 6784, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-09-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/0vrib2
title: Sorex araneus - 17124, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1956-08-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/t5edqe
title: Sorex araneus - 75979, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-07-12, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/fqq1hf
title: Sorex araneus - 19374, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-12-08, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/3mhjks
title: Sorex araneus - 107295, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-09-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/miu8uv
title: Sorex araneus - 25515, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-08-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/9fridh
title: Sorex araneus - 106523, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-07-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/uqyfkg
title: Sorex araneus - 107611, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-10-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/h5ed7n
title: Sorex araneus - 22860, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-08-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/zsrjta
title: Sorex araneus - 66589, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-10-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/oiirbw
title: Sorex araneus - 54973, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1966-10-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/qsqvn5
title: Sorex araneus - 3588, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-09-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/cgoatm
title: Sorex araneus - 2088, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-07-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/gjhy9b
title: Sorex araneus - 18477, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-07-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/lex3e1
title: Sorex araneus - 12540, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-08-13, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/vpojbz
title: Sorex araneus - 72805, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-04-22, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/casxvb
title: Sorex araneus - 15596, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-11-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/21iin7
title: Sorex araneus - 163980, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1995-09-22, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/j5fi01
title: Sorex araneus - 104980, 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/ugcqg7
title: Sorex araneus - 161033, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1991-07-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/uva5rd
title: Sorex araneus - 110177, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-06-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/albujt
title: Sorex araneus - 116130, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1975-02-22, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/emniru
title: Sorex araneus - 1956, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-07-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/bnd92i
title: Sorex araneus - 28463, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-07-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/lnedqv
title: Sorex araneus - 12408, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-08-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/096j3c
title: Sorex araneus - 138900, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1981-07-14, in: Białowieża National Park, Poland. Material type: