Content Provider
Cambridge University Press
39
Directory of Open Access Journals: DOAJ Articles
32
University of Calgary Journal Hosting
23
Washington State University: WSU Libraries Digital Collections
19
Unknown
18
Copernicus Publications: E-Journals
16
University of the Pacific, McGeorge School of Law: Scholarly Commons
14
University of the Pacific: Scholarly Commons
14
DataCite Metadata Store (German National Library of Science and Technology)
13
Canadian Science Publishing (via Crossref)
12
Niedersächsisches Online-Archiv NOA
11
University of British Columbia: cIRcle - UBC's Information Repository
9
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
6
Uppsala University: Publications (DiVA)
6
Defense Technical Information Center: DTIC Technical Reports database
5
MDPI Open Access Publishing
5
Ohio State University (OSU): Knowledge Bank
5
Summit - SFU Research Repository (Simon Fraser University)
5
Theses Canada/Thèses Canada (Library and Archives Canada)
5
University of Lethbridge Digitized Collections
5
Canadian Science Publishing
4
Caltech Authors (California Institute of Technology)
3
Hunter Library Digital Collections (Western Carolina University)
3
PRISM - University of Calgary Digital Repository
3
University of Saskatchewan: eCommons@USASK
3
University of Waterloo, Canada: Institutional Repository
3
Wiley Online Library (via Crossref)
3
uO Research (University of Ottawa - uOttawa)
3
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
2
Hathi Trust Digital Library
2
Institut national des sciences de l'Univers: HAL-INSU
2
North Dakota State University (NDSU): Digital Horizons
2
OhioLINK: Electronic Theses and Dissertations Center
2
The Library of Congress: American Memory
2
The Portal to Texas History (University of North Texas)
2
Universitet i Oslo: Digitale utgivelser ved UiO (DUO)
2
WikiBooks - Open-content textbooks
2
Wiley Online Library
2
École de technologie supérieure, Montréal: Espace ÉTS
2
ARPI - Archivio della Ricerca dell'Università di Pisa
1
Aarhus University: Research
1
Akademicka Platforma Czasopism
1
Akademicka Platforma Czasopism (APCZ)
1
Apollo - University of Cambridge Repository
1
Arca (BC's Digital Treasures)
1
CaltechOralHistories (California Institute of Technology)
1
Carleton University's Institutional Repository
1
ETH Zürich Research Collection
1
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
1
Ghent University Academic Bibliography
1
more ...