Content Provider
Biodiversity Heritage Library (BHL)
77
WikiBooks - Open-content textbooks
27
Unknown
8
Arca (BC's Digital Treasures)
7
UNBC's Digital Institutional Repository (University of Northern British Columbia)
4
Uppsala University: Publications (DiVA)
4
Oxford University Press (via Crossref)
3
University of Alaska: ScholarWorks@UA
3
JSTOR (via Crossref)
2
Texas A&M University Digital Repository
2
The National Academies Press (via Crossref)
2
Aalborg University's Research Portal
1
Australian National University: ANU Digital Collections
1
DataCite Metadata Store (German National Library of Science and Technology)
1
Digitale Bibliothek Mecklenburg-Vorpommern (Greifswald University)
1
James Cook University, Australia: ResearchOnline@JCU
1
LaCRIS - University of Lapland Current Research System
1
Ohio State University (OSU): Knowledge Bank
1
Publication Server of Goethe University Frankfurt am Main
1
Research Institute for Humanity and Nature Repository
1
Southern Cross University: epublications@SCU
1
TRUSpace - Thompson Rivers University
1
UMSL Digital Library (University of Missouri-St. Louis)
1
University College London: UCL Discovery
1
University of Copenhagen: Research
1
University of Vienna: Phaidra
1