Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
12,746
Skemman (Iceland)
5,007
Unknown
3,611
OECD iLibrary (via Crossref)
3,399
Hirsla - Landspítali University Hospital research archive
2,737
Directory of Open Access Journals: DOAJ Articles
2,440
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1,749
Opin vísindi (Iceland)
1,566
Zenodo
1,467
ScienceDirect (Elsevier - via Crossref)
1,411
the Digital Archaeological Record (via DataONE)
1,299
University of Iceland: Peer Reviewed Journals
1,254
RePEc (Research Papers in Economics)
1,200
Springer Nature (via Crossref)
1,068
PubMed Central (PMC)
1,063
PANGAEA - Data Publisher for Earth & Environmental Science
1,054
Université de Nantes: HAL-UNIV-NANTES
1,007
Wiley Online Library (via Crossref)
930
Wiley Online Library
871
Informa (via Crossref)
864
Cambridge University Press
741
HighWire Press (Stanford University)
689
Oxford University Press (via Crossref)
592
University of Copenhagen: Research
532
UNESDOC - UNESCO Digital Library
498
Aarhus University: Research
495
Institut national des sciences de l'Univers: HAL-INSU
495
LeibnizOpen (The Leibniz Association)
438
David Rumsey Historical Map Collection (Cartography Associates)
391
SAGE Publications (via Crossref)
372
Lund University Publications (LUP)
338
MDPI Open Access Publishing
308
Natural Environment Research Council: NERC Open Research Archive
307
ScienceDirect (Elsevier)
301
NOAA NCEI Environmental Data Archive (via DataONE)
296
WikiBooks - Open-content textbooks
290
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
288
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
288
JSTOR (via Crossref)
286
University of Southampton: e-Prints Soton
285
Hathi Trust Digital Library
280
Copernicus Publications: E-Journals
279
North Dakota State University (NDSU): Digital Horizons
265
Oxford University Press
254
Informa
250
Springer Nature
246
norden (Nordic Council of Ministers): Publications (DiVA)
246
Yale University: EliScholar
235
Defense Technical Information Center: DTIC Technical Reports database
234
Frontiers: Figshare
233
more ...