Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
497,656
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
242,031
PANGAEA - Data Publisher for Earth & Environmental Science
124,486
Directory of Open Access Journals: DOAJ Articles
105,984
Unknown
85,669
Zenodo
42,597
ScienceDirect (Elsevier - via Crossref)
37,172
Springer Nature (via Crossref)
34,515
University of Michigan: Digital Collections
32,111
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
26,824
Cambridge University Press
25,027
Wiley Online Library (via Crossref)
24,879
PubMed Central (PMC)
24,374
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
22,640
Wiley Online Library
21,789
Arctic Data Center (via DataONE)
18,653
Informa (via Crossref)
18,563
University of Washington, Seattle: Digital Collections
18,149
CyberLeninka (Scientific Electronic Library)
17,438
Université de Nantes: HAL-UNIV-NANTES
16,840
LeibnizOpen (The Leibniz Association)
13,501
Natural Environment Research Council: NERC Open Research Archive
13,081
Open Parks Network
12,990
Institut national des sciences de l'Univers: HAL-INSU
12,976
ScienceDirect (Elsevier)
12,790
Copernicus Publications: E-Journals
12,744
Defense Technical Information Center: DTIC Technical Reports database
11,329
Research Data Australia (Australian National Data Service - ANDS)
11,249
NOAA NCEI Environmental Data Archive (via DataONE)
10,707
Niedersächsisches Online-Archiv NOA
9,575
National Institute of Polar Research Repository, Japan
9,569
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
9,449
University of Tromsø: Munin Open Research Archive
8,864
Biodiversity Heritage Library (BHL)
8,824
Oxford University Press (via Crossref)
8,804
Digital.CSIC (Spanish National Research Council)
8,733
MDPI Open Access Publishing
8,594
Skemman (Iceland)
8,533
David Rumsey Historical Map Collection (Cartography Associates)
8,379
University of Copenhagen: Research
8,038
Canadian Science Publishing (via Crossref)
8,026
Aarhus University: Research
7,745
HighWire Press (Stanford University)
7,632
RePEc (Research Papers in Economics)
7,626
University of California: eScholarship
6,913
JSTOR (via Crossref)
6,559
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
6,325
Frontiers: Figshare
6,166
eCite UTAS (University of Tasmania)
6,002
OECD iLibrary (via Crossref)
5,885
more ...