Content Provider
Biodiversity Heritage Library (BHL)
14
Arctic Institute of North America
9
JSTOR
4
Sciendo (de Gruyter - via CrossRef)
4
Nova Southeastern University: NSU Works
3
DataCite Metadata Store (German National Library of Science and Technology)
2
De Gruyter (via Crossref)
2
Springer Nature (via Crossref)
2
Zenodo
2
Brill (via Crossref)
1
Informa
1
Informa (via Crossref)
1
Naturalis Digital Academic Repository (National Museum of Natural History in the Netherlands)
1
Naturalis Institutional Repository
1
Oxford University Press (via Crossref)
1
University of California: eScholarship
1
Wiley Online Library
1