Content Provider
Unknown
106
Directory of Open Access Journals: DOAJ Articles
65
DataCite Metadata Store (German National Library of Science and Technology)
57
Cambridge University Press
30
Oxford University Press (via Crossref)
26
Oxford University Press
24
National Chengchi University Institutional Repository (NCCUIR)
23
North Dakota State University (NDSU): Digital Horizons
23
CyberLeninka (Scientific Electronic Library)
21
LeibnizOpen (The Leibniz Association)
21
Defense Technical Information Center: DTIC Technical Reports database
16
Brill (via Crossref)
14
Hathi Trust Digital Library
13
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
11
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
10
Australian National University: ANU Digital Collections
9
Dialnet - Portada de revistas (Universidad de La Rioja)
9
University of Calgary Journal Hosting
9
Wiley Online Library
9
Aarhus University: OJS at The State and University Library
8
The University of Utah: J. Willard Marriott Digital Library
8
Tidsskrift.dk (The Royal Library, Denmark)
8
Cairn (E-Journals)
7
DergiPark Akademik (E-Journals)
7
University of Lethbridge Digitized Collections
7
eCite UTAS (University of Tasmania)
7
Biodiversity Heritage Library (BHL)
6
DataCite
6
David Rumsey Historical Map Collection (Cartography Associates)
6
EconStor (German National Library of Economics, ZBW)
6
Naval Postgraduate School: Calhoun
6
OpenEdition
6
RePEc (Research Papers in Economics)
6
SAGE Publications
6
Skemman (Iceland)
6
UTSA Digital Collections (The University of Texas at San Antonio)
6
University of Tromsø: Munin Open Research Archive
6
Arca (BC's Digital Treasures)
5
Danish Defense Research Portal
5
MDPI Open Access Publishing
5
Schulich Scholars (Schulich School of Law, Dalhousie University)
5
Tamkang University Institutional Repository (TKUIR) / 淡江大學機構典藏
5
University of California: eScholarship
5
University of Michigan: Digital Collections
5
University of Tasmania: UTas ePrints
5
Australian Policy Online (Institute for Social Research, Swinburne University of Technology)
4
Berkeley Law (University of California, Berkeley)
4
Cambridge University Press (via Crossref)
4
Emerald
4
Hunter Library Digital Collections (Western Carolina University)
4
more ...