Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
46,813
University of Michigan: Digital Collections
13,978
Unknown
5,457
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
5,381
Directory of Open Access Journals: DOAJ Articles
3,592
University of Lethbridge Digitized Collections
2,554
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
1,612
PubMed Central (PMC)
1,510
University of Washington, Seattle: Digital Collections
1,471
Wiley Online Library
1,198
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1,020
Arctic Data Center (via DataONE)
954
University of Calgary Journal Hosting
935
Canadian Science Publishing (via Crossref)
892
SFU Digitized Collections (Simon Fraser University)
886
Theses Canada/Thèses Canada (Library and Archives Canada)
837
NOAA NCEI Environmental Data Archive (via DataONE)
818
RePEc (Research Papers in Economics)
786
Cambridge University Press
784
Memorial University of Newfoundland: Research Repository
771
ScienceDirect (Elsevier - via Crossref)
726
Springer Nature (via Crossref)
725
David Rumsey Historical Map Collection (Cartography Associates)
697
Defense Technical Information Center: DTIC Technical Reports database
645
Université de Nantes: HAL-UNIV-NANTES
593
WikiBooks - Open-content textbooks
561
PANGAEA - Data Publisher for Earth & Environmental Science
533
DataCite
519
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
516
Érudit.org (Université Montréal)
499
University of British Columbia: cIRcle - UBC's Information Repository
480
Hathi Trust Digital Library
452
University of Toronto: Research Repository T-Space
450
Copernicus Publications: E-Journals
447
Dryad Digital Repository (Duke University)
440
MDPI Open Access Publishing
438
Borealis
432
North Dakota State University (NDSU): Digital Horizons
416
Queen's University, Ontario: QSpace
403
University of Nebraska-Lincoln: DigitalCommons@UNL
394
Informa (via Crossref)
384
Université Laval: CorpusUL
360
Canadian Science Publishing
345
HighWire Press (Stanford University)
345
MIT Libraries Dome
339
Dalhousie University: DalSpace Institutional Repository
332
Niedersächsisches Online-Archiv NOA
330
Arctic Council Repository
324
LeibnizOpen (The Leibniz Association)
324
National Research Council Canada: NRC Publications Archive
316
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