Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
6,189
University of Michigan: Digital Collections
602
NOAA NCEI Environmental Data Archive (via DataONE)
400
University of Lethbridge Digitized Collections
364
Unknown
301
University of British Columbia: cIRcle - UBC's Information Repository
280
Directory of Open Access Journals: DOAJ Articles
262
Arca (BC's Digital Treasures)
220
University of Washington, Seattle: Digital Collections
197
SFU Digitized Collections (Simon Fraser University)
172
USGS Science Data Catalog (via DataONE)
143
University of Victoria (Canada): UVicDSpace
137
UNBC's Digital Institutional Repository (University of Northern British Columbia)
131
VIURRSpace (Royal Roads University and Vancouver Island University)
123
PubMed Central (PMC)
114
Theses Canada/Thèses Canada (Library and Archives Canada)
95
Washington State University: WSU Libraries Digital Collections
79
Wiley Online Library
79
University of St Andrews: Research Portal
77
Vancouver Island University: Viuspace
64
Canadian Science Publishing (via Crossref)
61
Summit - SFU Research Repository (Simon Fraser University)
59
University of Calgary Journal Hosting
59
WikiBooks - Open-content textbooks
59
ESS-DIVE: Deep Insight for Earth Science Data (via DataONE)
56
PennState: Digital Collections
55
Zenodo
55
Dryad Digital Repository (Duke University)
46
RePEc (Research Papers in Economics)
46
PISCO MN (via DataONE)
43
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
37
TRUSpace - Thompson Rivers University
36
The Seattle Public Library Special Collections Online
35
David Rumsey Historical Map Collection (Cartography Associates)
33
Washington Rural Heritage (Washington State Library)
32
Washington State Library: Digital Collections and Resources
32
Cambridge University Press
30
Hathi Trust Digital Library
29
Western Washington University: CEDAR (Contributing to Education through Digital Access to Research)
28
Knowledge Network for Biocomplexity (via DataONE)
27
University of Toronto: Research Repository T-Space
27
Open Access Journal Hosting (University of British Columbia)
25
Oregon Digital (University of Oregon/Oregon State University)
25
University of Tromsø: Septentrio Academic Publishing
25
Queen's University, Ontario: QSpace
24
York University Digital Library
24
Royal Roads University: DSpace @ RRU
23
Borealis
21
LeibnizOpen (The Leibniz Association)
21
MDPI Open Access Publishing
21
more ...