Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
2,556
NOAA NCEI Environmental Data Archive (via DataONE)
2,113
PANGAEA - Data Publisher for Earth & Environmental Science
1,219
Defense Technical Information Center: DTIC Technical Reports database
888
Unknown
679
USGS Science Data Catalog (via DataONE)
481
Directory of Open Access Journals: DOAJ Articles
316
The University of Utah: J. Willard Marriott Digital Library
315
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
220
Cambridge University Press
196
University of Calgary Journal Hosting
180
Research Data Australia (Australian National Data Service - ANDS)
173
Gulf of Alaska Data Portal (via DataONE)
170
JSU Digital Commons (Jacksonville State University)
156
Arctic Data Center (via DataONE)
155
Zenodo
140
Knowledge Network for Biocomplexity (via DataONE)
131
University of Michigan: Digital Collections
130
Wiley Online Library
114
LeibnizOpen (The Leibniz Association)
107
University of Washington, Seattle: Digital Collections
95
Canadian Science Publishing (via Crossref)
87
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
76
Springer Nature (via Crossref)
75
IEDA: Marine-Geo Digital Library (via DataONE)
72
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
67
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
64
Natural Environment Research Council: NERC Open Research Archive
63
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
63
Research Workspace (via DataONE)
61
University of St Andrews: Research Portal
60
University of Nebraska-Lincoln: DigitalCommons@UNL
59
ScienceDirect (Elsevier - via Crossref)
58
University of California: eScholarship
57
PubMed Central (PMC)
52
Canadian Science Publishing
50
Biodiversity Heritage Library (BHL)
49
Aarhus University: Research
47
Washington State University: WSU Libraries Digital Collections
47
Frontiers: Figshare
42
ScienceDirect (Elsevier)
42
Informa (via Crossref)
41
National Institute of Polar Research Repository, Japan
40
ArXiv.org (Cornell University Library)
39
Biological and Chemical Oceanography Data Management Office (BCO-DMO) (via DataONE)
39
Hathi Trust Digital Library
39
MDPI Open Access Publishing
39
Université de Nantes: HAL-UNIV-NANTES
39
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
37
Arctic Institute of North America (via Crossref)
35
more ...