Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
97,761
PANGAEA - Data Publisher for Earth & Environmental Science
17,645
Unknown
11,424
Directory of Open Access Journals: DOAJ Articles
10,022
Research Data Australia (Australian National Data Service - ANDS)
7,774
Springer Nature (via Crossref)
7,396
Natural Environment Research Council: NERC Open Research Archive
7,322
Zenodo
7,148
ScienceDirect (Elsevier - via Crossref)
6,307
Cambridge University Press
6,048
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
5,641
National Institute of Polar Research Repository, Japan
4,930
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
4,691
Ohio State University (OSU): Knowledge Bank
3,623
PubMed Central (PMC)
3,498
eCite UTAS (University of Tasmania)
3,347
Informa (via Crossref)
3,329
Université de Nantes: HAL-UNIV-NANTES
3,311
Wiley Online Library (via Crossref)
2,965
Institut national des sciences de l'Univers: HAL-INSU
2,963
Wiley Online Library
2,791
Copernicus Publications: E-Journals
2,655
LeibnizOpen (The Leibniz Association)
2,095
IEDA: Marine-Geo Digital Library (via DataONE)
2,085
ScienceDirect (Elsevier)
1,984
Niedersächsisches Online-Archiv NOA
1,835
NASA Technical Reports Server (NTRS)
1,723
Digital.CSIC (Spanish National Research Council)
1,683
University of Tasmania: UTas ePrints
1,671
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
1,524
University of California: eScholarship
1,425
MDPI Open Access Publishing
1,413
Biodiversity Heritage Library (BHL)
1,365
AU Digital Research Archive (American University)
1,349
Informa
1,242
National Library of Australia: Digital Collections
1,241
David Rumsey Historical Map Collection (Cartography Associates)
1,149
HAL Sorbonne Université
1,149
Frontiers: Figshare
1,086
Oxford University Press (via Crossref)
1,047
Australian National University: ANU Digital Collections
1,046
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
1,046
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires)
1,016
Defense Technical Information Center: DTIC Technical Reports database
955
University of Southampton: e-Prints Soton
938
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
906
Université Grenoble Alpes: HAL
897
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
881
HighWire Press (Stanford University)
861
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
846
more ...