cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.48370/ofd/dwtevv
title: Sorex araneus - 93881, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1970-09-25, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/c2mvfl
title: Sorex araneus - 136121, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1980-07-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/rohhli
title: Sorex araneus - 106421, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-07-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/2xpssg
title: Sorex araneus - 76353, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-08-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/zjo2ol
title: Sorex araneus - 107506, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-09-25, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/pbt9rq
title: Sorex araneus - 65074, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-08-28, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/uxlbmi
title: Sorex araneus - 30816, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-10-21, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/a5xolo
title: Sorex araneus - 62335, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-04-09, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/udcd2g
title: Sorex araneus - 18919, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-09-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/hnjvrc
title: Sorex araneus - 26321, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-10-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/gdftbh
title: Sorex araneus - 31555, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-04-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/m9fkmn
title: Sorex araneus - 33599, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-09-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/pfgxii
title: Sorex araneus - 98005, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-07-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ejtytw
title: Sorex araneus - 2399, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-07-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/92g08m
title: Sorex araneus - 66838, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-11-28, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xf9izq
title: Sorex araneus - 28448, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-07-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/6ggjfz
title: Sorex araneus - 28987, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-09-04, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/me47zi
title: Sorex araneus - 98353, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-07-17, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/8jczwj
title: Sorex araneus - 65044, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-08-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/q5balz
title: Sorex araneus - 62256, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-03-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/rl6beg
title: Sorex araneus - 61994, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-02-08, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/j8iqcr
title: Sorex araneus - 22490, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-06-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/aezqgv
title: Sorex araneus - 13612, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/k8txry
title: Sorex araneus - 91889, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1970-08-12, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/2ew5pi
title: Sorex araneus - 52057, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1966-06-12, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wszbjk
title: Sorex araneus - 22208, 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/glwb8e
title: Sorex araneus - 97799, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-06-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/8rieuf
title: Sorex araneus - 116982, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1975-08-21, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/cljili
title: Sorex araneus - 3568, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-09-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/bm2xv4
title: Sorex araneus - 98798, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-07-31, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/li3bj4
title: Sorex araneus - 3214, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-08-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/qaxh86
title: Sorex araneus - 106855, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-07-28, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/o42sqd
title: Sorex araneus - 22159, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-06-09, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/m3um4o
title: Sorex araneus - 16876, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1956-06-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/i9ov63
title: Sorex araneus - 19903, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1958-04-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/nprvcn
title: Sorex araneus - 19963, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1958-05-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ayhe6q
title: Sorex araneus - 19071, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-09-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ft189h
title: Sorex araneus - 30983, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-11-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/tz24iy
title: Sorex araneus - 2690, 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/nl0ghk
title: Sorex araneus - 5535, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/231qqu
title: Sorex araneus - 52929, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1966-07-21, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/5mkeld
title: Sorex araneus - 12034, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-07-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/3xsmhi
title: Sorex araneus - 55489, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1966-12-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/7ztgnu
title: Sorex araneus - 96931, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-02-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/3db8nx
title: Sorex araneus - 15055, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/j2cahm
title: Sorex araneus - 12106, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-08-04, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/yvd8or
title: Sorex araneus - 169367, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 2004-09-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/dd8ghi
title: Sorex araneus - 76871, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-09-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/mcjnvm
title: Sorex araneus - 20245, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1958-08-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ofe0k8
title: Sorex araneus - 76304, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-08-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/3xdiyb
title: Sorex araneus - 15045, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/3rhk7e
title: Sorex araneus - 33653, 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/hegnhw
title: Sorex araneus - 22898, 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/26o5ca
title: Sorex araneus - 97842, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-06-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/efzlfo
title: Sorex araneus - 7295, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-12-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/t0fvny
title: Sorex araneus - 4520, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-06-08, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/51zwta
title: Sorex araneus - 1913, 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/d0wugn
title: Sorex araneus - 110655, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-08-22, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/jwagy6
title: Sorex araneus - 85633, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1969-06-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/nvshbc
title: Sorex araneus - 32930, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-08-24, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/t56dat
title: Sorex araneus - 5133, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/we65iw
title: Sorex araneus - 110463, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-07-25, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/tku65q
title: Sorex araneus - 17343, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1956-09-08, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/kdq9g0
title: Sorex araneus - 22699, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-07-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/mrvdma
title: Sorex araneus - 107046, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-08-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/nlhga5
title: Sorex araneus - 12707, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-08-18, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/5ngugk
title: Sorex araneus - 17736, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-01-28, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/lernk5
title: Sorex araneus - 1887, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-06-28, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/kdybar
title: Sorex araneus - 25000, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-06-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/lyde2z
title: Sorex araneus - 5074, 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/aigwpk
title: Sorex araneus - 3699, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-09-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ogb2bq
title: Sorex araneus - 162409, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1992-10-18, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ffn28y
title: Sorex araneus - 4925, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/0uw2kn
title: Sorex araneus - 35481, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1964-05-22, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/am7y2a
title: Sorex araneus - 118548, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1976-02-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ogrnz2
title: Sorex araneus - 28646, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-08-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/hkykyy
title: Sorex araneus - 7923, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-04-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ug0u7d
title: Sorex araneus - 1927, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-06-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/junoz3
title: Sorex araneus - 1759, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-06-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/w12arf
title: Sorex araneus - 106561, 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/2obqar
title: Sorex araneus - 76011, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-07-13, in: Białowieża National Park, Poland. Material type: