Content Provider
Washington State University: WSU Libraries Digital Collections
25
University of Calgary Journal Hosting
19
Cambridge University Press
10
University of Alaska: ScholarWorks@UA
5
Unknown
4
Digital Collections of Colorado (Colorado State University)
3
Mountain Scholar (Digital Collections of Colorado and Wyoming)
3
The Library of Congress: American Memory
3
University of Lethbridge Digitized Collections
3
Cambridge University Press (via Crossref)
2
Hathi Trust Digital Library
2
North Dakota State University (NDSU): Digital Horizons
2
PubMed Central (PMC)
2
Apollo - University of Cambridge Repository
1
Arca (BC's Digital Treasures)
1
Central Washington University: ScholarWorks
1
Defense Technical Information Center: DTIC Technical Reports database
1
Directory of Open Access Journals: DOAJ Articles
1
Federation of Finnish Learned Societies: Scientific Journals Online
1
HighWire Press (Stanford University)
1
Hunter Library Digital Collections (Western Carolina University)
1
Indiana University: Digital Library of the Commons (DLC)
1
Loyola University Chicago Digital Special Collections
1
Mississippi State University: Digital Collections
1
SAGE Publications (via Crossref)
1
The Seattle Public Library Special Collections Online
1
University of Northern Iowa: UNI ScholarWorks
1
University of Tromsø: Septentrio Academic Publishing
1
University of Washington: ResearchWorks Journal Hosting
1
University of the Pacific, McGeorge School of Law: Scholarly Commons
1
University of the Pacific: Scholarly Commons
1
Wiley Online Library
1