Content Provider
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
5,757
WikiBooks - Open-content textbooks
4,608
Biodiversity Heritage Library (BHL)
4,604
Unknown
1,072
Aarhus University: Research
714
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
713
University of Copenhagen: Research
499
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
460
Cambridge University Press
456
Technical University of Denmark: DTU Orbit
446
OLAC: Open Language Archives Community
415
UNESDOC - UNESCO Digital Library
304
norden (Nordic Council of Ministers): Publications (DiVA)
280
David Rumsey Historical Map Collection (Cartography Associates)
260
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
246
DataCite Metadata Store (German National Library of Science and Technology)
238
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
Oxford University Press (via Crossref)
230
University College Dublin: UCD Digital Library
222
JSTOR
198
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)
175
LaCRIS - University of Lapland Current Research System
162
Texas A&M University Digital Repository
161
Springer Nature (via Crossref)
153
Open Research Library
148
Uppsala University: Publications (DiVA)
147
VTT's Research Information Portal
146
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
144
RePEc (Research Papers in Economics)
140
Université de Nantes: HAL-UNIV-NANTES
137
Electronic Library of Belarusian State Technological University
135
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto
134
Aalborg University's Research Portal
126
De Gruyter
124
OECD iLibrary (via Crossref)
118
Texas A&M University Galveston Campus: DSpace Repository
116
Doria (National Library of Finland)
111
OpenAgrar (OA)
107
e-rara.ch (ETH Zürich)
104
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
92
JSTOR (via Crossref)
87
Biblioteca Virtual de Defensa (BVD - Ministerio de Defensa de España)
86
Johns Hopkins University Press
86
Biblioteca Digital de Aranjuez
80
Roskilde University Research Portal (RUC)
79
more ...