Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
22,376
PANGAEA - Data Publisher for Earth & Environmental Science
7,514
Unknown
4,563
Directory of Open Access Journals: DOAJ Articles
3,634
University of Copenhagen: Research
3,252
University of Michigan: Digital Collections
2,752
Arctic Data Center (via DataONE)
2,708
Aarhus University: Research
2,562
Zenodo
2,088
ScienceDirect (Elsevier - via Crossref)
1,838
Cambridge University Press
1,637
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1,476
Copernicus Publications: E-Journals
1,470
Springer Nature (via Crossref)
1,425
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1,378
Technical University of Denmark: DTU Orbit
1,350
LeibnizOpen (The Leibniz Association)
1,327
PubMed Central (PMC)
1,040
Wiley Online Library
991
Niedersächsisches Online-Archiv NOA
965
Institut national des sciences de l'Univers: HAL-INSU
964
David Rumsey Historical Map Collection (Cartography Associates)
925
Université de Nantes: HAL-UNIV-NANTES
915
NOAA NCEI Environmental Data Archive (via DataONE)
896
Defense Technical Information Center: DTIC Technical Reports database
867
Wiley Online Library (via Crossref)
850
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
738
Informa (via Crossref)
737
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
624
Natural Environment Research Council: NERC Open Research Archive
572
University of California: eScholarship
570
Biodiversity Heritage Library (BHL)
521
ScienceDirect (Elsevier)
489
University of Southern Denmark Research Portal
465
NASA Technical Reports Server (NTRS)
447
Apollo - University of Cambridge Repository
445
Utrecht University Repository
444
University of Calgary Journal Hosting
439
Digital.CSIC (Spanish National Research Council)
429
HighWire Press (Stanford University)
409
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
402
JSTOR (via Crossref)
377
Oxford University Press (via Crossref)
370
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
370
Aalborg University's Research Portal
357
Aarhus University: OJS at The State and University Library
348
Tidsskrift.dk (The Royal Library, Denmark)
348
University of Liège: ORBi (Open Repository and Bibliography)
346
Lund University Publications (LUP)
342
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
341
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