Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
3,450
Unknown
2,618
Skemman (Iceland)
2,516
Directory of Open Access Journals: DOAJ Articles
2,371
Hirsla - Landspítali University Hospital research archive
1,679
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1,659
ScienceDirect (Elsevier - via Crossref)
1,363
Opin vísindi (Iceland)
1,285
PubMed Central (PMC)
1,059
PANGAEA - Data Publisher for Earth & Environmental Science
1,052
Wiley Online Library (via Crossref)
962
Université de Nantes: HAL-UNIV-NANTES
951
Springer Nature (via Crossref)
768
Wiley Online Library
693
HighWire Press (Stanford University)
689
Informa (via Crossref)
662
Cambridge University Press
563
University of Copenhagen: Research
511
Institut national des sciences de l'Univers: HAL-INSU
478
Aarhus University: Research
456
Oxford University Press (via Crossref)
401
SAGE Publications (via Crossref)
369
UNESDOC - UNESCO Digital Library
319
Lund University Publications (LUP)
317
LeibnizOpen (The Leibniz Association)
316
MDPI Open Access Publishing
308
Zenodo
286
Copernicus Publications: E-Journals
279
ScienceDirect (Elsevier)
275
Hathi Trust Digital Library
261
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
247
WikiBooks - Open-content textbooks
241
norden (Nordic Council of Ministers): Publications (DiVA)
241
Defense Technical Information Center: DTIC Technical Reports database
234
HAL Sorbonne Université
223
University of Iceland: Peer Reviewed Journals
223
Apollo - University of Cambridge Repository
215
Niedersächsisches Online-Archiv NOA
212
CESSDA DC Data Catalogue (Consortium of European Social Science Data Archives)
205
Yale University: EliScholar
205
Informa
198
University of Southampton: e-Prints Soton
191
Oxford University Press
185
Natural Environment Research Council: NERC Open Research Archive
182
Uppsala University: Publications (DiVA)
181
University of Bergen: Bergen Open Research Archive (BORA-UiB)
172
University of North Texas: UNT Digital Library
171
Universitet i Oslo: Digitale utgivelser ved UiO (DUO)
170
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
160
Arctic Council Repository
153
more ...