Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
410,687
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
242,031
DataCite
129,975
PANGAEA - Data Publisher for Earth & Environmental Science
128,658
Directory of Open Access Journals: DOAJ Articles
116,371
Unknown
85,530
Zenodo
55,205
Wiley Online Library
45,068
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
PubMed Central (PMC)
26,166
Cambridge University Press
25,674
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
23,017
ScienceDirect (Elsevier)
20,807
Arctic Data Center (via DataONE)
18,658
University of Washington, Seattle: Digital Collections
18,149
CyberLeninka (Scientific Electronic Library)
17,438
Université de Nantes: HAL-UNIV-NANTES
16,904
LeibnizOpen (The Leibniz Association)
14,206
Copernicus Publications: E-Journals
13,803
Institut national des sciences de l'Univers: HAL-INSU
13,355
Natural Environment Research Council: NERC Open Research Archive
13,217
Open Parks Network
12,990
Informa (via Crossref)
12,392
Research Data Australia (Australian National Data Service - ANDS)
11,470
Defense Technical Information Center: DTIC Technical Reports database
11,329
Informa
10,899
NOAA NCEI Environmental Data Archive (via DataONE)
10,707
Niedersächsisches Online-Archiv NOA
9,807
National Institute of Polar Research Repository, Japan
9,588
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
9,550
Biodiversity Heritage Library (BHL)
9,394
University of Tromsø: Munin Open Research Archive
9,185
Digital.CSIC (Spanish National Research Council)
9,094
Skemman (Iceland)
8,896
David Rumsey Historical Map Collection (Cartography Associates)
8,673
MDPI Open Access Publishing
8,594
University of Copenhagen: Research
8,178
Aarhus University: Research
7,947
HighWire Press (Stanford University)
7,642
RePEc (Research Papers in Economics)
7,626
Oxford University Press
7,280
University of California: eScholarship
7,236
Hathi Trust Digital Library
7,100
Frontiers: Figshare
6,697
WikiBooks - Open-content textbooks
6,557
Canadian Science Publishing
6,418
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
6,342
more ...