Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
36,391
University of Washington, Seattle: Digital Collections
14,706
Open Parks Network
9,261
University of Michigan: Digital Collections
7,897
Arctic Data Center (via DataONE)
6,579
Unknown
3,891
Zenodo
3,449
University of Alaska: ScholarWorks@UA
3,165
Washington State University: WSU Libraries Digital Collections
2,016
Directory of Open Access Journals: DOAJ Articles
1,862
NOAA NCEI Environmental Data Archive (via DataONE)
1,665
PANGAEA - Data Publisher for Earth & Environmental Science
1,620
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1,213
USGS Science Data Catalog (via DataONE)
1,121
Defense Technical Information Center: DTIC Technical Reports database
1,118
SFU Digitized Collections (Simon Fraser University)
1,082
Wiley Online Library
1,001
University of Calgary Journal Hosting
973
Knowledge Network for Biocomplexity (via DataONE)
914
Dryad Digital Repository (Duke University)
911
Wiley Online Library (via Crossref)
902
University of the Pacific, McGeorge School of Law: Scholarly Commons
897
University of the Pacific: Scholarly Commons
894
David Rumsey Historical Map Collection (Cartography Associates)
790
Cambridge University Press
782
PubMed Central (PMC)
714
Hathi Trust Digital Library
696
University of North Texas: UNT Digital Library
676
Biodiversity Heritage Library (BHL)
655
APS Digital Library (American Philosophical Society)
624
Canadian Science Publishing (via Crossref)
547
University of California: eScholarship
530
The Library of Congress: American Memory
526
ScienceDirect (Elsevier - via Crossref)
518
Beloit College Digital Collections
461
University of Florida: Digital Library Center
460
Arctic Institute of North America (via Crossref)
458
Informa (via Crossref)
452
Copernicus Publications: E-Journals
406
Oxford University Press (via Crossref)
404
Springer Nature (via Crossref)
396
Oregon Digital (University of Oregon/Oregon State University)
373
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
370
Santa Clara University: SCU Digital Collections
356
OhioLINK: Ohio Digital Resource Commons (DRC)
352
Research Workspace (via DataONE)
352
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
350
The University of Utah: J. Willard Marriott Digital Library
319
The Seattle Public Library Special Collections Online
316
NASA Technical Reports Server (NTRS)
314
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