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
124,634
Directory of Open Access Journals: DOAJ Articles
105,984
Unknown
85,660
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
25,193
PubMed Central (PMC)
24,502
Wiley Online Library
23,606
Wiley Online Library (via Crossref)
23,329
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
22,678
Arctic Data Center (via DataONE)
18,653
University of Washington, Seattle: Digital Collections
18,149
Informa (via Crossref)
17,651
CyberLeninka (Scientific Electronic Library)
17,438
Université de Nantes: HAL-UNIV-NANTES
16,844
LeibnizOpen (The Leibniz Association)
13,501
Natural Environment Research Council: NERC Open Research Archive
13,100
Institut national des sciences de l'Univers: HAL-INSU
13,043
Open Parks Network
12,990
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
9,623
National Institute of Polar Research Repository, Japan
9,569
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
9,456
University of Tromsø: Munin Open Research Archive
8,897
Biodiversity Heritage Library (BHL)
8,831
Digital.CSIC (Spanish National Research Council)
8,765
MDPI Open Access Publishing
8,594
Skemman (Iceland)
8,538
David Rumsey Historical Map Collection (Cartography Associates)
8,485
Oxford University Press (via Crossref)
8,278
University of Copenhagen: Research
8,054
Aarhus University: Research
7,769
HighWire Press (Stanford University)
7,633
RePEc (Research Papers in Economics)
7,626
Canadian Science Publishing (via Crossref)
7,462
University of California: eScholarship
6,929
JSTOR (via Crossref)
6,470
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
6,325
Frontiers: Figshare
6,191
eCite UTAS (University of Tasmania)
6,002
OECD iLibrary (via Crossref)
5,885
more ...