cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.48370/ofd/9d6y22
title: Sorex araneus - 138384, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1981-02-04, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/fidylo
title: Sorex araneus - 5656, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/3aodqt
title: Sorex araneus - 22640, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-07-08, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xzbdrv
title: Sorex araneus - 97944, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-06-28, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/bkkt3y
title: Sorex araneus - 16575, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1956-03-18, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/b0n6g4
title: Sorex araneus - 12904, 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/svxm7q
title: Sorex araneus - 9003, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-06-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/pipg3m
title: Sorex araneus - 3153, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-08-17, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/copflo
title: Sorex araneus - 32774, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-08-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/kwuxlo
title: Sorex araneus - 2870, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-08-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ulgpmm
title: Sorex araneus - 109308, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-02-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/j3eatp
title: Sorex araneus - 106988, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-07-31, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/kkx3ak
title: Sorex araneus - 1883, 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/dbemrm
title: Sorex araneus - 5090, 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/ppt3jd
title: Sorex araneus - 110580, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-08-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/hsr7ky
title: Sorex araneus - 20112, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1958-07-22, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/in9eow
title: Sorex araneus - 25422, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-07-31, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/5183ly
title: Sorex araneus - 4606, 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/tlz1im
title: Sorex araneus - 106837, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-07-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/c5k3gt
title: Sorex araneus - 119016, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1976-07-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/jmxq3t
title: Sorex araneus - 22944, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-08-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/hzlyg5
title: Sorex araneus - 10692, 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/llxpot
title: Sorex araneus - 94808, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1970-10-11, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/om1pja
title: Sorex araneus - 4632, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-06-13, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xeguy3
title: Sorex araneus - 5655, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/rfypyf
title: Sorex araneus - 5721, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-08-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/1ttieu
title: Sorex araneus - 116391, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1975-07-04, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/it24dn
title: Sorex araneus - 74533, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-06-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/hduf02
title: Sorex araneus - 90792, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1970-05-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/vyycuh
title: Sorex araneus - 10680, 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/uvkkst
title: Sorex araneus - 99306, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-09-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/c1rphr
title: Sorex araneus - 116191, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1975-04-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/4gw0l5
title: Sorex araneus - 98869, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-08-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/bwztj4
title: Sorex araneus - 110178, 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/kquu1v
title: Sorex araneus - 76102, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-07-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/9ivzyq
title: Sorex araneus - 25022, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-06-22, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/fwucfk
title: Sorex araneus - 11644, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-07-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ryzjmr
title: Sorex araneus - 34267, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-11-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wwi5ir
title: Sorex araneus - 28862, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-08-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/bs7kym
title: Sorex araneus - 7579, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-02-12, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/tm6b5s
title: Sorex araneus - 109976, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-04-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/c1igjp
title: Sorex araneus - 94850, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1970-10-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/u2fxkp
title: Sorex araneus - 169355, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 2004-09-24, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/1ktvls
title: Sorex araneus - 6335, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-08-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/tksugl
title: Sorex araneus - 3135, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-08-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/dznutd
title: Sorex araneus - 44700, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1965-08-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/oifnzd
title: Sorex araneus - 14015, 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/edlud0
title: Sorex araneus - 22062, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-06-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/1krd63
title: Sorex araneus - 110800, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-09-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/pzjm6u
title: Sorex araneus - 18426, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-07-08, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ltcoqt
title: Sorex araneus - 4997, 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/uryppt
title: Sorex araneus - 104203, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-12-08, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/jeqpsm
title: Sorex araneus - 91797, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1970-08-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/4ed50l
title: Sorex araneus - 1198, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-06-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/pmcwk6
title: Sorex araneus - 22507, 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/5kyxz7
title: Sorex araneus - 9706, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-07-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/66an2l
title: Sorex araneus - 3136, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-08-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/a6igu8
title: Sorex araneus - 29025, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-09-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/wncjia
title: Sorex araneus - 27935, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-04-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/jdm1lm
title: Sorex araneus - 1988, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-07-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/g2hlou
title: Sorex araneus - 26210, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-10-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/0jgm8l
title: Sorex araneus - 115797, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1974-11-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/yci2lp
title: Sorex araneus - 2135, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-07-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/akqmxx
title: Sorex araneus - 23900, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1960-08-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/gls20d
title: Sorex araneus - 99897, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-10-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/2qwela
title: Sorex araneus - 35174, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1964-04-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/larfjb
title: Sorex araneus - 8595, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-06-08, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/vheaje
title: Sorex araneus - 76750, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-08-24, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/pv86uk
title: Sorex araneus - 76212, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1968-07-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/8mztwa
title: Sorex araneus - 99144, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-09-17, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/0jhqmj
title: Sorex araneus - 17998, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-04-25, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ypilkt
title: Sorex araneus - 4352, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-05-18, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/toezp1
title: Sorex araneus - 17418, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1956-09-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/o2eovt
title: Sorex araneus - 91809, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1970-08-07, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/uttkef
title: Sorex araneus - 6700, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-09-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/c34noc
title: Sorex araneus - 20198, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1958-08-09, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ncbiqg
title: Sorex araneus - 22670, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-07-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/g2tjsf
title: Sorex araneus - 10941, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-07-17, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/6wn2wk
title: Sorex araneus - 110630, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-08-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/gvenkb
title: Sorex araneus - 26864, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-01-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/bsrzq2
title: Sorex araneus - 34527, 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: