cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.48370/ofd/3yzpvo
title: Sorex araneus - 4614, 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/tt6ozl
title: Sorex araneus - 24605, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-05-24, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/n5ial6
title: Sorex araneus - 10202, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-07-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/vyanxf
title: Sorex araneus - 64155, 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/5ahl7i
title: Sorex araneus - 15782, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-11-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wfh0lf
title: Sorex araneus - 104840, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-06-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xfpuwp
title: Sorex araneus - 54040, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1966-08-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/sv7ffz
title: Sorex araneus - 17382, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1956-09-13, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wmonfm
title: Sorex araneus - 8165, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-05-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/paiwog
title: Sorex araneus - 110125, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-06-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/njhshi
title: Sorex araneus - 4441, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-06-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/7buz1i
title: Sorex araneus - 168388, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 2002-07-08, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/zq4nol
title: Sorex araneus - 15378, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-10-21, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/g36xii
title: Sorex araneus - 13213, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-08-31, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/fagojn
title: Sorex araneus - 107138, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-08-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/mxe21g
title: Sorex araneus - 29086, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-09-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/teeuvz
title: Sorex araneus - 23190, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-09-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/pnejsk
title: Sorex araneus - 16173, 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/vqneba
title: Sorex araneus - 117023, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1975-08-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/n3hby9
title: Sorex araneus - 3546, 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/jgef1g
title: Sorex araneus - 51658, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1966-04-13, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/fi8uxm
title: Sorex araneus - 54579, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1966-09-25, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ftnr1z
title: Sorex araneus - 97787, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-06-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/gypqeq
title: Sorex araneus - 63215, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-06-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/hpxsfk
title: Sorex araneus - 28827, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-08-21, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/kvn8rc
title: Sorex araneus - 9989, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-07-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/qncatd
title: Sorex araneus - 2738, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-07-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/aamjra
title: Sorex araneus - 57077, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-01-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/dr3foe
title: Sorex araneus - 166928, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1998-07-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xszdno
title: Sorex araneus - 20263, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1958-08-21, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/gbzxen
title: Sorex araneus - 27929, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-04-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/cvyjgu
title: Sorex araneus - 19686, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1958-01-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/62hl1k
title: Sorex araneus - 31857, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-06-13, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/hdojwl
title: Sorex araneus - 14499, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xmdr9l
title: Sorex araneus - 3473, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-09-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/9vqjba
title: Sorex araneus - 25292, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-07-22, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/l01fck
title: Sorex araneus - 98603, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-07-25, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/zxilmj
title: Sorex araneus - 110659, 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/ulk6u7
title: Sorex araneus - 62421, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-04-24, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/6jjhwm
title: Sorex araneus - 111178, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-10-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/r62mzl
title: Sorex araneus - 35462, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1964-05-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/388a9i
title: Sorex araneus - 106265, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-07-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/9uoqlj
title: Sorex araneus - 12708, 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/bakvor
title: Sorex araneus - 95512, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1970-11-13, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/jws6fj
title: Sorex araneus - 30933, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-11-17, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/rvymi9
title: Sorex araneus - 97459, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-04-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/p6tspp
title: Sorex araneus - 1762, 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/jhccqz
title: Sorex araneus - 107271, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-09-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/euofsa
title: Sorex araneus - 22506, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-07-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/3skdsn
title: Sorex araneus - 98624, 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/vra2ph
title: Sorex araneus - 19186, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-10-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ossnlx
title: Sorex araneus - 23844, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1960-07-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ksvy3v
title: Sorex araneus - 18227, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-06-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wtxkz5
title: Sorex araneus - 163293, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1994-07-08, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/hh3n47
title: Sorex araneus - 12538, 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/tulcif
title: Sorex araneus - 65098, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-08-31, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/jph5xd
title: Sorex araneus - 167818, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 2000-07-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/rulz3p
title: Sorex araneus - 99558, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-10-04, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/mx6h9b
title: Sorex araneus - 5227, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/bwyeqo
title: Sorex araneus - 21931, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-06-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/sncic5
title: Sorex araneus - 3636, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-09-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/j7yztu
title: Sorex araneus - 97934, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-06-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/yjhxjh
title: Sorex araneus - 106637, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-07-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/u0gvwa
title: Sorex araneus - 163606, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1994-09-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xbvpce
title: Sorex araneus - 4482, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-06-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/rmms9e
title: Sorex araneus - 107270, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-09-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/mj42ww
title: Sorex araneus - 3035, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-08-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/5hbgfe
title: Sorex araneus - 21717, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-05-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/kuvml5
title: Sorex araneus - 2428, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-07-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/bq4znz
title: Sorex araneus - 1577, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-06-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/f9ufri
title: Sorex araneus - 8559, 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/triomd
title: Sorex araneus - 22270, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-06-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/cml1iv
title: Sorex araneus - 146992, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1983-07-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/tvkze5
title: Sorex araneus - 146286, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1983-05-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/oddlgu
title: Sorex araneus - 1105, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-06-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xzpf8u
title: Sorex araneus - 5114, 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/wjom0f
title: Sorex araneus - 55574, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1966-12-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wkqmqy
title: Sorex araneus - 3415, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-08-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/swyadd
title: Sorex araneus - 1037, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-06-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/6utlnv
title: Sorex araneus - 6202, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-08-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/zieklj
title: Sorex araneus - 113221, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1974-04-20, in: Białowieża National Park, Poland. Material type: