Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
20,314
PANGAEA - Data Publisher for Earth & Environmental Science
7,345
Unknown
4,497
Directory of Open Access Journals: DOAJ Articles
3,617
University of Michigan: Digital Collections
2,750
Arctic Data Center (via DataONE)
2,708
University of Copenhagen: Research
2,599
Aarhus University: Research
2,218
Zenodo
2,046
ScienceDirect (Elsevier - via Crossref)
1,838
Cambridge University Press
1,471
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1,469
Copernicus Publications: E-Journals
1,463
Springer Nature (via Crossref)
1,425
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1,361
LeibnizOpen (The Leibniz Association)
1,238
Technical University of Denmark: DTU Orbit
1,057
PubMed Central (PMC)
1,029
Niedersächsisches Online-Archiv NOA
942
Université de Nantes: HAL-UNIV-NANTES
913
David Rumsey Historical Map Collection (Cartography Associates)
896
NOAA NCEI Environmental Data Archive (via DataONE)
896
Defense Technical Information Center: DTIC Technical Reports database
867
Wiley Online Library (via Crossref)
808
Informa (via Crossref)
751
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
738
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
622
Natural Environment Research Council: NERC Open Research Archive
570
Wiley Online Library
558
University of California: eScholarship
551
Biodiversity Heritage Library (BHL)
519
ScienceDirect (Elsevier)
489
NASA Technical Reports Server (NTRS)
447
Apollo - University of Cambridge Repository
441
University of Calgary Journal Hosting
439
Utrecht University Repository
431
Digital.CSIC (Spanish National Research Council)
427
Institut national des sciences de l'Univers: HAL-INSU
416
HighWire Press (Stanford University)
409
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
393
JSTOR (via Crossref)
370
Aarhus University: OJS at The State and University Library
347
Tidsskrift.dk (The Royal Library, Denmark)
347
University of Southern Denmark Research Portal
347
BORIS (Bern Open Repository and Information System, University of Bern)
321
Lund University Publications (LUP)
317
Aalborg University's Research Portal
313
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
311
GEUS Bulletin (Geological Survey of Denmark and Greenland)
305
MDPI Open Access Publishing
303
more ...