Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
506,461
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
242,031
PANGAEA - Data Publisher for Earth & Environmental Science
125,280
Directory of Open Access Journals: DOAJ Articles
105,984
Unknown
85,434
Zenodo
42,597
Wiley Online Library
40,814
Springer Nature (via Crossref)
34,515
University of Michigan: Digital Collections
32,111
ScienceDirect (Elsevier - via Crossref)
29,734
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
26,824
Cambridge University Press
25,304
PubMed Central (PMC)
24,720
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
22,777
ScienceDirect (Elsevier)
20,807
Arctic Data Center (via DataONE)
18,654
University of Washington, Seattle: Digital Collections
18,149
CyberLeninka (Scientific Electronic Library)
17,438
Université de Nantes: HAL-UNIV-NANTES
16,854
Informa (via Crossref)
15,920
LeibnizOpen (The Leibniz Association)
13,501
Natural Environment Research Council: NERC Open Research Archive
13,128
Institut national des sciences de l'Univers: HAL-INSU
13,043
Open Parks Network
12,990
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
9,722
National Institute of Polar Research Repository, Japan
9,570
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
9,464
University of Tromsø: Munin Open Research Archive
8,908
Wiley Online Library (via Crossref)
8,861
Digital.CSIC (Spanish National Research Council)
8,857
Biodiversity Heritage Library (BHL)
8,831
MDPI Open Access Publishing
8,594
Skemman (Iceland)
8,577
David Rumsey Historical Map Collection (Cartography Associates)
8,485
University of Copenhagen: Research
8,102
Aarhus University: Research
7,806
HighWire Press (Stanford University)
7,634
RePEc (Research Papers in Economics)
7,626
Oxford University Press (via Crossref)
7,505
Canadian Science Publishing (via Crossref)
7,189
Informa
7,066
University of California: eScholarship
6,941
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
6,326
Frontiers: Figshare
6,246
eCite UTAS (University of Tasmania)
6,002
OECD iLibrary (via Crossref)
5,867
more ...