Content Provider
Open Parks Network
2,175
Unknown
359
Washington State University: WSU Libraries Digital Collections
339
DataCite Metadata Store (German National Library of Science and Technology)
227
Hathi Trust Digital Library
156
PubMed Central (PMC)
119
Defense Technical Information Center: DTIC Technical Reports database
75
Copernicus Publications: E-Journals
68
University of the Pacific, McGeorge School of Law: Scholarly Commons
52
University of the Pacific: Scholarly Commons
52
MDPI Open Access Publishing
45
University of Michigan: Digital Collections
43
BioOne Online Journals
35
Project Gutenberg (PG)
30
Érudit.org (Université Montréal)
25
HighWire Press (Stanford University)
23
University of Florida: Digital Library Center
17
Digital Collections of Colorado (Colorado State University)
15
Mountain Scholar (Digital Collections of Colorado and Wyoming)
15
Arca (BC's Digital Treasures)
14
Central Washington University: ScholarWorks
14
UNBC's Digital Institutional Repository (University of Northern British Columbia)
11
The University of Western Ontario: Scholarship@Western
9
Saint Mary's University, Halifax: Institutional Repository
7
Western Washington University: CEDAR (Contributing to Education through Digital Access to Research)
7
North Dakota State University (NDSU): Digital Horizons
6
UQAM - Université du Québec à Montréal: archipel
5
University of Illinois at Urbana-Champaign: UIUC Digitized Books
5
University of San Diego: Digital@USanDiego
5
Hunter Library Digital Collections (Western Carolina University)
4
Princeton Theological Seminary: Theological Commons
4
The Library of Congress: American Memory
4
American Museum of Natural History: AMNH scientific publications
3
OhioLINK: Electronic Theses and Dissertations Center
3
Purdue University: e-Pubs
3
University of Northern Iowa: UNI ScholarWorks
3
APS Digital Library (American Philosophical Society)
2
Harvard University: Harvard Collections
2
IRD (Institute de recherche pour le développement): Horizon
2
Queen's University, Ontario: QSpace
2
University of Illinois at Urbana-Champaign: IDEALS (Illinois Digital Environment for Access to Learning and Scholarship)
2
University of Nebraska-Lincoln: DigitalCommons@UNL
2
University of Tennessee, Knoxville: Scholarly Communication Services
2
University of Texas at El Paso: Digital Commons@UTEP
2
Université du Québec à Chicoutimi (UQAC): Constellation
2
Wilfrid Laurier University, Ontario: Scholars Commons@Laurier
2
York University Digital Library
2
Arizona Memory Project (Arizona State Library, Archives and Public Records)
1
Athabasca University Digitization Portal
1
Ball State University: Digital Media Repository
1
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