Content Provider
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
5,757
Biodiversity Heritage Library (BHL)
4,608
WikiBooks - Open-content textbooks
4,608
Unknown
1,072
Aarhus University: Research
719
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
713
University of Copenhagen: Research
501
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
460
Cambridge University Press
456
Technical University of Denmark: DTU Orbit
447
David Rumsey Historical Map Collection (Cartography Associates)
430
OLAC: Open Language Archives Community
415
UNESDOC - UNESCO Digital Library
304
norden (Nordic Council of Ministers): Publications (DiVA)
280
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
246
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
238
University of Southampton: e-Prints Soton
236
Arctic Portal Library
233
DataCite Metadata Store (German National Library of Science and Technology)
228
University College Dublin: UCD Digital Library
222
Oxford University Press (via Crossref)
217
JSTOR
208
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
192
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
192
Springer Nature
185
Informa (via Crossref)
165
LaCRIS - University of Lapland Current Research System
162
Texas A&M University Digital Repository
161
RePEc (Research Papers in Economics)
154
Springer Nature (via Crossref)
153
Open Research Library
148
Uppsala University: Publications (DiVA)
147
VTT's Research Information Portal
146
De Gruyter
145
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
144
Electronic Library of Belarusian State Technological University
137
Université de Nantes: HAL-UNIV-NANTES
137
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto
130
Aalborg University's Research Portal
124
OECD iLibrary (via Crossref)
118
Texas A&M University Galveston Campus: DSpace Repository
116
Doria (National Library of Finland)
112
OpenAgrar (OA)
105
e-rara.ch (ETH Zürich)
105
Brill
101
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
94
Johns Hopkins University Press
90
Biblioteca Virtual de Defensa (BVD - Ministerio de Defensa de España)
86
Oxford University Press
84
Biblioteca Digital de Aranjuez
80
more ...