Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
4,476
North Dakota State University (NDSU): Digital Horizons
615
Directory of Open Access Journals: DOAJ Articles
583
Unknown
506
PANGAEA - Data Publisher for Earth & Environmental Science
432
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
380
The University of Utah: J. Willard Marriott Digital Library
349
University of Lethbridge Digitized Collections
348
Wiley Online Library
327
Zenodo
314
Research Data Australia (Australian National Data Service - ANDS)
262
PubMed Central (PMC)
240
Natural Environment Research Council: NERC Open Research Archive
190
ScienceDirect (Elsevier - via Crossref)
179
Springer Nature (via Crossref)
173
University of California: eScholarship
167
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
160
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
141
Iowa State University Library Digital Collections
126
Defense Technical Information Center: DTIC Technical Reports database
121
Institut national des sciences de l'Univers: HAL-INSU
118
University of the Pacific, McGeorge School of Law: Scholarly Commons
118
University of the Pacific: Scholarly Commons
117
Arctic Data Center (via DataONE)
116
NASA Technical Reports Server (NTRS)
113
ScienceDirect (Elsevier)
108
Cambridge University Press
105
Aarhus University: Research
103
NOAA NCEI Environmental Data Archive (via DataONE)
102
Université de Nantes: HAL-UNIV-NANTES
102
LeibnizOpen (The Leibniz Association)
101
University of Michigan: Deep Blue
99
USGS Science Data Catalog (via DataONE)
94
Copernicus Publications: E-Journals
92
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
92
University of Alaska: ScholarWorks@UA
87
eCite UTAS (University of Tasmania)
85
David Rumsey Historical Map Collection (Cartography Associates)
84
University of Nebraska-Lincoln: DigitalCommons@UNL
84
Dryad Digital Repository (Duke University)
83
ORA - Oxford University Research Archive
80
University of St Andrews: Research Portal
79
University of Washington, Seattle: Digital Collections
76
APS Digital Library (American Philosophical Society)
74
Hunter Library Digital Collections (Western Carolina University)
74
Biological and Chemical Oceanography Data Management Office (BCO-DMO) (via DataONE)
70
Informa (via Crossref)
70
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
69
University of Calgary Journal Hosting
68
Niedersächsisches Online-Archiv NOA
66
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