Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
1,986
NOAA NCEI Environmental Data Archive (via DataONE)
921
USGS Science Data Catalog (via DataONE)
630
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
428
PANGAEA - Data Publisher for Earth & Environmental Science
307
Zenodo
267
Unknown
215
Directory of Open Access Journals: DOAJ Articles
166
Digital.CSIC (Spanish National Research Council)
143
Instituto Español de Oceanografía: e-IEO
134
Defense Technical Information Center: DTIC Technical Reports database
79
Natural Environment Research Council: NERC Open Research Archive
79
University of Washington, Seattle: Digital Collections
69
Research Data Australia (Australian National Data Service - ANDS)
67
University of Calgary Journal Hosting
61
Biodiversity Heritage Library (BHL)
45
University of Michigan: Digital Collections
44
Canadian Science Publishing (via Crossref)
42
University of Southampton: e-Prints Soton
40
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
39
Washington State University: WSU Libraries Digital Collections
38
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
37
Cambridge University Press
37
Institute for Marine Research: Brage IMR
37
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
35
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
35
HighWire Press (Stanford University)
34
University of Lethbridge Digitized Collections
32
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
31
Springer Nature (via Crossref)
30
Yale University: EliScholar
29
ScienceDirect (Elsevier - via Crossref)
27
Arctic Data Center (via DataONE)
26
MDPI Open Access Publishing
23
Digital Library of University of Maribor
22
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
22
OpenAgrar (OA)
22
University of Bergen: Bergen Open Research Archive (BORA-UiB)
22
University of Rhode Island: DigitalCommons@URI
22
Wageningen UR (University & Research Centre): Digital Library
22
Copernicus Publications: E-Journals
21
University of the Highlands and Islands: Research Database of UHI
21
Université de Nantes: HAL-UNIV-NANTES
21
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
20
Magnolia press
20
Wiley Online Library (via Crossref)
20
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
20
Wiley Online Library
19
ScienceDirect (Elsevier)
18
Technical University of Denmark: DTU Orbit
18
more ...