Content Provider
WikiBooks - Open-content textbooks
6,557
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
5,757
Biodiversity Heritage Library (BHL)
4,704
Unknown
1,071
Aarhus University: Research
723
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
714
David Rumsey Historical Map Collection (Cartography Associates)
525
University of Copenhagen: Research
504
Technical University of Denmark: DTU Orbit
464
Cambridge University Press
460
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
460
OLAC: Open Language Archives Community
438
UNESDOC - UNESCO Digital Library
304
norden (Nordic Council of Ministers): Publications (DiVA)
284
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
246
Arctic Portal Library
245
Biblioteca Virtual de Defensa (BVD - Ministerio de Defensa de España)
243
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
238
University of Southampton: e-Prints Soton
237
DataCite Metadata Store (German National Library of Science and Technology)
229
JSTOR
222
University College Dublin: UCD Digital Library
222
De Gruyter
205
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
193
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
192
Springer Nature
185
LaCRIS - University of Lapland Current Research System
172
Oxford University Press (via Crossref)
172
Texas A&M University Digital Repository
161
RePEc (Research Papers in Economics)
154
Springer Nature (via Crossref)
153
Open Research Library
151
Uppsala University: Publications (DiVA)
147
VTT's Research Information Portal
147
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
144
Université de Nantes: HAL-UNIV-NANTES
138
Electronic Library of Belarusian State Technological University
137
Informa
133
Oxford University Press
125
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto
122
Texas A&M University Galveston Campus: DSpace Repository
116
Aalborg University's Research Portal
115
Doria (National Library of Finland)
112
e-rara.ch (ETH Zürich)
108
Brill
107
OpenAgrar (OA)
106
University of Groningen research database
105
Wiley Online Library
103
OECD iLibrary (via Crossref)
102
Zenodo
97
more ...