Content Provider
WikiBooks - Open-content textbooks
469
Biodiversity Heritage Library (BHL)
349
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
158
Unknown
83
UNESDOC - UNESCO Digital Library
58
Arca (BC's Digital Treasures)
48
UNBC's Digital Institutional Repository (University of Northern British Columbia)
41
UQAM - Université du Québec à Montréal: archipel
36
OLAC: Open Language Archives Community
33
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
31
RePEc (Research Papers in Economics)
29
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
28
Open Research Library
20
Arctic Portal Library
14
PRISM - University of Calgary Digital Repository
14
DataCite Metadata Store (German National Library of Science and Technology)
13
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
13
Cambridge University Press
12
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
12
Université de Nantes: HAL-UNIV-NANTES
12
JSTOR
11
University of Copenhagen: Research
11
Australian National University: ANU Digital Collections
9
Oxford University Press (via Crossref)
9
Oxford University Press
7
ScholarSpace at University of Hawaii at Manoa
7
Technical University of Denmark: DTU Orbit
7
Aarhus University: Research
6
Johns Hopkins University Press
6
Aalborg University's Research Portal
5
Arctic Council Repository
5
OpenEdition
5
University of the Highlands and Islands: Research Database of UHI
5
norden (Nordic Council of Ministers): Publications (DiVA)
5
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
4
Pensoft Publishers
4
Texas A&M University Digital Repository
4
The London School of Economics and Political Science: LSE Research Online
4
USRA Houston Repository (Universities Space Research Association)
4
University of Lapland: Lauda
4
University of Malta: OAR@UM
4
University of North Texas: UNT Digital Library
4
University of Victoria (Canada): UVicDSpace
4
Université Paris 1 Panthéon-Sorbonne: HAL
4
uO Research (University of Ottawa - uOttawa)
4
Cornell University: eCommons@Cornell
3
De Gruyter
3
International Development Research Centre: IDRC Digital Library
3
JSTOR (via Crossref)
3
LaCRIS - University of Lapland Current Research System
3
more ...