Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
483,121
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
242,031
PANGAEA - Data Publisher for Earth & Environmental Science
123,528
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
Wiley Online Library (via Crossref)
28,054
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
26,824
Cambridge University Press
24,948
PubMed Central (PMC)
24,374
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
22,621
Informa (via Crossref)
19,304
Arctic Data Center (via DataONE)
18,653
University of Washington, Seattle: Digital Collections
18,149
Wiley Online Library
18,035
CyberLeninka (Scientific Electronic Library)
17,438
Université de Nantes: HAL-UNIV-NANTES
16,838
LeibnizOpen (The Leibniz Association)
13,501
Natural Environment Research Council: NERC Open Research Archive
13,064
Open Parks Network
12,990
Institut national des sciences de l'Univers: HAL-INSU
12,902
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
National Institute of Polar Research Repository, Japan
9,568
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
9,437
Niedersächsisches Online-Archiv NOA
9,405
Oxford University Press (via Crossref)
9,233
University of Tromsø: Munin Open Research Archive
8,840
Biodiversity Heritage Library (BHL)
8,797
Digital.CSIC (Spanish National Research Council)
8,724
MDPI Open Access Publishing
8,594
Skemman (Iceland)
8,532
Canadian Science Publishing (via Crossref)
8,409
David Rumsey Historical Map Collection (Cartography Associates)
8,379
University of Copenhagen: Research
7,948
Aarhus University: Research
7,700
HighWire Press (Stanford University)
7,632
RePEc (Research Papers in Economics)
7,237
University of California: eScholarship
6,889
JSTOR (via Crossref)
6,607
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
6,325
Frontiers: Figshare
6,150
eCite UTAS (University of Tasmania)
6,002
OECD iLibrary (via Crossref)
5,885
more ...