Content Provider
University of Washington, Seattle: Digital Collections
4,169
DataCite Metadata Store (German National Library of Science and Technology)
3,189
Open Parks Network
2,191
University of Michigan: Digital Collections
1,449
Unknown
657
Washington State University: WSU Libraries Digital Collections
445
DataCite
364
Directory of Open Access Journals: DOAJ Articles
361
University of Calgary Journal Hosting
341
Arctic Data Center (via DataONE)
331
The Seattle Public Library Special Collections Online
286
Knowledge Network for Biocomplexity (via DataONE)
224
USGS Science Data Catalog (via DataONE)
209
University of Lethbridge Digitized Collections
204
Hathi Trust Digital Library
201
Canadian Science Publishing (via Crossref)
196
University of Alaska: ScholarWorks@UA
192
Digitized @ Henry Madden Library (FresnoState)
160
University of British Columbia: cIRcle - UBC's Information Repository
152
Cambridge University Press
148
Wiley Online Library
146
PubMed Central (PMC)
120
Arctic Institute of North America
112
Theses Canada/Thèses Canada (Library and Archives Canada)
109
Arca (BC's Digital Treasures)
108
Dryad Digital Repository (Duke University)
92
The Library of Congress: American Memory
89
Borealis
80
Springer Nature (via Crossref)
80
Defense Technical Information Center: DTIC Technical Reports database
75
ScienceDirect (Elsevier - via Crossref)
75
Canadian Science Publishing
73
PANGAEA - Data Publisher for Earth & Environmental Science
70
RePEc (Research Papers in Economics)
70
Copernicus Publications: E-Journals
67
University of the Pacific, McGeorge School of Law: Scholarly Commons
56
University of the Pacific: Scholarly Commons
56
University of Toronto: Research Repository T-Space
54
University of Florida: Digital Library Center
53
uO Research (University of Ottawa - uOttawa)
53
Niedersächsisches Online-Archiv NOA
50
VIURRSpace (Royal Roads University and Vancouver Island University)
47
Informa (via Crossref)
46
Wiley Online Library (via Crossref)
46
Cambridge University Press (via Crossref)
44
MDPI Open Access Publishing
44
PRISM - University of Calgary Digital Repository
44
Carleton University's Institutional Repository
43
JSTOR (via Crossref)
43
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
41
more ...