Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
10,725
NOAA NCEI Environmental Data Archive (via DataONE)
580
Zenodo
571
University of Washington, Seattle: Digital Collections
498
Unknown
356
Arctic Data Center (via DataONE)
270
Directory of Open Access Journals: DOAJ Articles
229
University of Michigan: Digital Collections
204
USGS Science Data Catalog (via DataONE)
195
University of Calgary Journal Hosting
161
David Rumsey Historical Map Collection (Cartography Associates)
137
University of Alaska: ScholarWorks@UA
107
Defense Technical Information Center: DTIC Technical Reports database
94
Washington State University: WSU Libraries Digital Collections
90
Canadian Science Publishing (via Crossref)
85
WikiBooks - Open-content textbooks
85
PubMed Central (PMC)
80
Copernicus Publications: E-Journals
70
ESS-DIVE: Deep Insight for Earth Science Data (via DataONE)
70
University of Lethbridge Digitized Collections
69
Knowledge Network for Biocomplexity (via DataONE)
63
Cambridge University Press
59
Wiley Online Library (via Crossref)
59
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
58
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
56
Wiley Online Library
54
International Arctic Research Center (IARC) Data Archive (via DataONE)
50
Niedersächsisches Online-Archiv NOA
49
PANGAEA - Data Publisher for Earth & Environmental Science
45
RePEc (Research Papers in Economics)
45
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
44
PISCO MN (via DataONE)
43
Dryad Digital Repository (Duke University)
41
LeibnizOpen (The Leibniz Association)
39
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
39
The Portal to Texas History (University of North Texas)
39
University of Nebraska-Lincoln: DigitalCommons@UNL
37
North Dakota State University (NDSU): Digital Horizons
35
University of the Pacific, McGeorge School of Law: Scholarly Commons
31
University of the Pacific: Scholarly Commons
31
Cambridge University Press (via Crossref)
30
Arctic Council Repository
29
Gulf of Alaska Data Portal (via DataONE)
28
UQAM - Université du Québec à Montréal: archipel
28
University of California: eScholarship
28
University of North Texas: UNT Digital Library
28
Université de Nantes: HAL-UNIV-NANTES
27
VIURRSpace (Royal Roads University and Vancouver Island University)
27
Magnolia press
26
Biological and Chemical Oceanography Data Management Office (BCO-DMO) (via DataONE)
24
more ...