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
124,523
Directory of Open Access Journals: DOAJ Articles
105,984
Unknown
85,664
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
25,114
PubMed Central (PMC)
24,374
Wiley Online Library
23,564
Wiley Online Library (via Crossref)
23,361
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
22,654
Arctic Data Center (via DataONE)
18,653
University of Washington, Seattle: Digital Collections
18,149
Informa (via Crossref)
18,062
CyberLeninka (Scientific Electronic Library)
17,438
Université de Nantes: HAL-UNIV-NANTES
16,842
LeibnizOpen (The Leibniz Association)
13,501
Natural Environment Research Council: NERC Open Research Archive
13,089
Institut national des sciences de l'Univers: HAL-INSU
13,042
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
9,597
National Institute of Polar Research Repository, Japan
9,569
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
9,453
University of Tromsø: Munin Open Research Archive
8,876
Biodiversity Heritage Library (BHL)
8,831
Digital.CSIC (Spanish National Research Council)
8,750
MDPI Open Access Publishing
8,594
Skemman (Iceland)
8,535
Oxford University Press (via Crossref)
8,511
David Rumsey Historical Map Collection (Cartography Associates)
8,379
University of Copenhagen: Research
8,043
Aarhus University: Research
7,755
Canadian Science Publishing (via Crossref)
7,701
HighWire Press (Stanford University)
7,632
RePEc (Research Papers in Economics)
7,626
University of California: eScholarship
6,924
JSTOR (via Crossref)
6,510
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
6,325
Frontiers: Figshare
6,182
eCite UTAS (University of Tasmania)
6,002
OECD iLibrary (via Crossref)
5,885
more ...