cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.48370/ofd/jiftzo
title: Sorex araneus - 3856, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-10-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/yfsop3
title: Sorex araneus - 31820, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-06-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/koi1zi
title: Sorex araneus - 113790, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1974-08-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/nshhsj
title: Sorex araneus - 64120, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-07-21, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/yoatdd
title: Sorex araneus - 35797, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1964-07-03, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/as7mfl
title: Sorex araneus - 107589, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-09-30, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/gmsgko
title: Sorex araneus - 23124, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-08-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/rb1phu
title: Sorex araneus - 115428, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1974-10-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xkv89o
title: Sorex araneus - 9316, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-06-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xs8edw
title: Sorex araneus - 52067, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1966-06-14, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ioaqct
title: Sorex araneus - 25920, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-09-13, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/9xd844
title: Sorex araneus - 34678, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1964-01-25, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/zfok8m
title: Sorex araneus - 5613, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ejysg8
title: Sorex araneus - 155538, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1987-07-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/mufp2h
title: Sorex araneus - 4998, 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/jchp5e
title: Sorex araneus - 117020, 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/llqn6k
title: Sorex araneus - 157708, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1988-07-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ngcv7l
title: Sorex araneus - 12992, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-08-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/mpewhu
title: Sorex araneus - 18516, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-07-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/sadz8b
title: Sorex araneus - 14708, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-09-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/vah9qq
title: Sorex araneus - 4519, 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/ijl6uf
title: Sorex araneus - 12865, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-08-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/dlbvf9
title: Sorex araneus - 8839, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-06-13, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/mciymh
title: Sorex araneus - 11129, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-07-20, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/6du9f7
title: Sorex araneus - 62221, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1967-03-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/8zpqfx
title: Sorex araneus - 107286, 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/pks9bb
title: Sorex araneus - 110532, 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/8xn8lp
title: Sorex araneus - 108018, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-11-17, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/2w28mw
title: Sorex araneus - 16338, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1956-01-17, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ju3c0e
title: Sorex araneus - 32929, 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/emmv0d
title: Sorex araneus - 104578, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-05-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/r7m4au
title: Sorex araneus - 114073, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1974-07-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/avkifd
title: Sorex araneus - 21951, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-06-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/klhefa
title: Sorex araneus - 98844, 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/wojwai
title: Sorex araneus - 24600, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-05-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/dqpy38
title: Sorex araneus - 44661, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1965-07-28, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/lkbdui
title: Sorex araneus - 32853, 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/wpmmmv
title: Sorex araneus - 13081, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-08-28, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/iohgqw
title: Sorex araneus - 5805, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-08-04, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/avkwzj
title: Sorex araneus - 26944, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-02-06, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/2jg9pr
title: Sorex araneus - 16711, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1956-04-09, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/yppdri
title: Sorex araneus - 111054, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-09-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/9ieqne
title: Sorex araneus - 30894, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1962-11-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/olgljn
title: Sorex araneus - 5681, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-31, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/t0ygjz
title: Sorex araneus - 29015, 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/ajr8jt
title: Sorex araneus - 98313, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-07-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/0jdzhy
title: Sorex araneus - 25942, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1961-09-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/llovcq
title: Sorex araneus - 64176, 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/4c7ahl
title: Sorex araneus - 5694, 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/kizbcy
title: Sorex araneus - 18438, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-07-09, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/7tdewb
title: Sorex araneus - 6749, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-09-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/zjvcwv
title: Sorex araneus - 5468, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/fsf468
title: Sorex araneus - 5359, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-07-21, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/ojtbs1
title: Sorex araneus - 22246, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-06-13, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/54wu2u
title: Sorex araneus - 91357, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1970-07-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/qgzhyr
title: Sorex araneus - 106538, 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/n3nerc
title: Sorex araneus - 23052, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1959-08-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/hl7oct
title: Sorex araneus - 164001, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1995-10-10, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/bazqsz
title: Sorex araneus - 162411, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1992-10-19, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/z5pvum
title: Sorex araneus - 110465, 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/jrjx77
title: Sorex araneus - 19230, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-11-04, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/4pfbev
title: Sorex araneus - 5149, 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/82cskj
title: Sorex araneus - 106711, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1972-07-24, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/0bdymu
title: Sorex araneus - 98508, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-07-23, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/uphbe9
title: Sorex araneus - 2783, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-07-31, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/yyezht
title: Sorex araneus - 166910, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1998-07-15, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/icbzwq
title: Sorex araneus - 20145, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1958-07-28, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/eh1yts
title: Sorex araneus - 5755, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1954-08-02, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/giajf2
title: Sorex araneus - 9056, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1955-06-16, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/u5gr7p
title: Sorex araneus - 99473, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1971-09-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/img6un
title: Sorex araneus - 20138, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1958-07-27, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/o8dkh8
title: Sorex araneus - 111237, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1973-10-18, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/lt2qd0
title: Sorex araneus - 106922, 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/o5j2ie
title: Sorex araneus - 98628, 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/1wxept
title: Sorex araneus - 31596, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1963-05-01, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xnifse
title: Sorex araneus - 18679, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1957-08-05, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/nmwwld
title: Sorex araneus - 153199, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1986-07-29, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/mqxoqd
title: Sorex araneus - 1846, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1953-06-26, in: Białowieża National Park, Poland. Material type:
DOI: 10.48370/ofd/xrtl0g
title: Sorex araneus - 5075, 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/tzxmnx
title: Sorex araneus - 1920, 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/dzucnu
title: Sorex araneus - 17477, Zoological collection of the Mammal Research Institute, PAS

description: Sorex araneus (Common shrew) from Zoological collection of the Mammal Research Institute, PAS. Collected 1956-10-03, in: Białowieża National Park, Poland. Material type: