Content Provider
Biodiversity Heritage Library (BHL)
781
WikiBooks - Open-content textbooks
486
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
125
Unknown
116
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
84
Cambridge University Press
69
Wiley Online Library (via Crossref)
64
David Rumsey Historical Map Collection (Cartography Associates)
51
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
43
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
39
National Institute of Polar Research Repository, Japan
37
University of Southampton: e-Prints Soton
36
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
35
UNESDOC - UNESCO Digital Library
34
Springer Nature (via Crossref)
31
Springer Nature
29
Informa (via Crossref)
28
USRA Houston Repository (Universities Space Research Association)
27
Oxford University Press (via Crossref)
26
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
23
Australian National University: ANU Digital Collections
23
OpenAgrar (OA)
22
The National Academies Press (via Crossref)
19
GEO-LEOe-docs (FID GEO)
18
Open Research Library
18
DataCite Metadata Store (German National Library of Science and Technology)
16
Texas A&M University Digital Repository
16
UiTM Digital Repository (Universiti Teknologi Mara)
15
University of Otago: OUR Heritage (Otage University Research)
15
University of Copenhagen: Research
14
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
13
Technical University of Denmark: DTU Orbit
13
Université de Nantes: HAL-UNIV-NANTES
13
School of Oriental and African Studies, University of London: SOAS Research Online
12
Zenodo
12
JSTOR
11
Wiley Online Library
11
De Gruyter
10
Oxford University Press
10
RePEc (Research Papers in Economics)
10
Ohio State University (OSU): Knowledge Bank
9
University of Bristol: Bristol Research
9
The University of Warwick: WRAP - Warwick Research Archive Portal
8
eCite UTAS (University of Tasmania)
8
IIASA DARE (Data Repository of the International Institute of Applied Systems Analysis)
7
IIASA PURE (International Institute of Applied Systems Analysis: PUblications REpository)
7
Institut national des sciences de l'Univers: HAL-INSU
7
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
7
Old Dominion University: ODU Digital Commons
7
University of North Texas: UNT Digital Library
7
more ...