Content Provider
Biodiversity Heritage Library (BHL)
486
WikiBooks - Open-content textbooks
222
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
36
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
35
Unknown
32
UQAM - Université du Québec à Montréal: archipel
25
University of Alaska: ScholarWorks@UA
24
RePEc (Research Papers in Economics)
21
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
17
Oxford University Press (via Crossref)
17
David Rumsey Historical Map Collection (Cartography Associates)
16
Texas A&M University Digital Repository
13
Arca (BC's Digital Treasures)
11
Cambridge University Press
11
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
9
OpenAgrar (OA)
9
UNBC's Digital Institutional Repository (University of Northern British Columbia)
9
University of North Texas: UNT Digital Library
9
Oxford University Press
8
Australian National University: ANU Digital Collections
6
JSTOR
5
UNESDOC - UNESCO Digital Library
5
USRA Houston Repository (Universities Space Research Association)
5
Uppsala University: Publications (DiVA)
5
Aalborg University's Research Portal
4
IIASA DARE (Data Repository of the International Institute of Applied Systems Analysis)
4
IIASA PURE (International Institute of Applied Systems Analysis: PUblications REpository)
4
Technical University of Denmark: DTU Orbit
4
University of Copenhagen: Research
4
DataCite Metadata Store (German National Library of Science and Technology)
3
Open Research Library
3
Texas A&M University Galveston Campus: DSpace Repository
3
Texas Tech University: TTU DSpace Repository
3
The National Academies Press (via Crossref)
3
Arctic Portal Library
2
Biblioteca Digital de Aranjuez
2
Biblioteca Virtual de Defensa (BVD - Ministerio de Defensa de España)
2
Falmouth University Research Repository (FURR)
2
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
2
Johns Hopkins University Press
2
OLAC: Open Language Archives Community
2
PRISM - University of Calgary Digital Repository
2
Publication Server of Goethe University Frankfurt am Main
2
Texas Tech University: Southwest Collection/Special Collections Library
2
UNC Press (The University of North Carolina - via Crossref)
2
Universita degli Studi di Trieste: OpenstarTs
2
University of California Press
2
University of Groningen research database
2
University of St Andrews: Research Portal
2
University of Western Sydney (UWS): Research Direct
2
more ...