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
125,201
Directory of Open Access Journals: DOAJ Articles
105,984
Unknown
85,462
Zenodo
42,597
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
25,285
Wiley Online Library
24,768
PubMed Central (PMC)
24,502
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
22,722
Wiley Online Library (via Crossref)
22,402
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
Informa (via Crossref)
17,096
Université de Nantes: HAL-UNIV-NANTES
16,854
LeibnizOpen (The Leibniz Association)
13,501
Natural Environment Research Council: NERC Open Research Archive
13,115
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
9,688
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
8,903
Biodiversity Heritage Library (BHL)
8,831
Digital.CSIC (Spanish National Research Council)
8,810
MDPI Open Access Publishing
8,594
Skemman (Iceland)
8,560
David Rumsey Historical Map Collection (Cartography Associates)
8,485
University of Copenhagen: Research
8,094
Oxford University Press (via Crossref)
7,908
Aarhus University: Research
7,806
HighWire Press (Stanford University)
7,633
RePEc (Research Papers in Economics)
7,626
Canadian Science Publishing (via Crossref)
7,198
University of California: eScholarship
6,936
JSTOR (via Crossref)
6,424
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
6,326
Frontiers: Figshare
6,230
eCite UTAS (University of Tasmania)
6,002
Informa
5,870
more ...