Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
1,831
Unknown
45
NOAA NCEI Environmental Data Archive (via DataONE)
44
Arctic Data Center (via DataONE)
35
Defense Technical Information Center: DTIC Technical Reports database
33
University of Calgary Journal Hosting
33
Directory of Open Access Journals: DOAJ Articles
31
Cambridge University Press
28
Hathi Trust Digital Library
13
IEDA: Marine-Geo Digital Library (via DataONE)
12
MDPI Open Access Publishing
10
Natural Environment Research Council: NERC Open Research Archive
7
PubMed Central (PMC)
7
Technical University of Denmark: DTU Orbit
7
Wiley Online Library
7
Aarhus University: Research
6
Copernicus Publications: E-Journals
6
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
6
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
6
Technical University of Denmark (DTU): Fighsare
6
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
5
Northern Arizona University (NAU): Special Collections and Archives
5
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
5
KovsieScholar Repository (University of the Free State - UFS UV)
4
NASA Technical Reports Server (NTRS)
4
PANGAEA - Data Publisher for Earth & Environmental Science
4
University of Copenhagen: Research
4
University of Southampton: e-Prints Soton
4
Digital.CSIC (Spanish National Research Council)
3
Fiskeridirektoratet (Brage FISK)
3
German Aerospace Center: elib - DLR electronic library
3
Ohio State University (OSU): Knowledge Bank
3
RePEc (Research Papers in Economics)
3
Universitat Politècnica de Catalunya (UPC): Theses and Dissertations Online (TDX)
3
Université de Nantes: HAL-UNIV-NANTES
3
Aarhus University: OJS at The State and University Library
2
Apollo - University of Cambridge Repository
2
Bellevue University: Digital Archive Collection
2
Edinburgh Research Archive (ERA - University of Edinburgh)
2
Georgia Institute of Technology: SMARTech - Scholarly Materials and Research at Georgia Tech
2
Lund University Publications (LUP)
2
NGU Open Archive (Geological Survey of Norway)
2
National Research Council Canada: NRC Publications Archive
2
Oxford University Press (via Crossref)
2
Queen's University, Ontario: QSpace
2
Springer Nature (via Crossref)
2
TU Berlin: Deposit Once
2
The Royal Society
2
Tidsskrift.dk (The Royal Library, Denmark)
2
United Nations Publications (via Crossref)
2
more ...