Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
1,356
David Rumsey Historical Map Collection (Cartography Associates)
10
NOAA NCEI Environmental Data Archive (via DataONE)
7
WikiBooks - Open-content textbooks
6
University of Hertfordshire: UH Research Archive
3
Wiley Online Library
3
Oxford University Press
2
The University of Utah: J. Willard Marriott Digital Library
2
Directory of Open Access Journals: DOAJ Articles
1
IOP Publishing
1
Joint Research Centre, European Commission: JRC Publications Repository
1
MSpace at the University of Manitoba
1
Murdoch University: Murdoch Research Repository
1
Natural Environment Research Council: NERC Open Research Archive
1
North Dakota State University (NDSU): Digital Horizons
1
Project Gutenberg (PG)
1
Repositorio Institucional de la UPCH (Universidad Peruana Cayetano Heredia)
1
The University of Warwick: WRAP - Warwick Research Archive Portal
1
Theses Canada/Thèses Canada (Library and Archives Canada)
1
University of California: eScholarship
1
University of Groningen research database
1
University of Malta: OAR@UM
1
University of Southern Queensland: USQ ePrints
1
University of Tromsø: Munin Open Research Archive
1
University of Washington, Seattle: Digital Collections
1
University of the Pacific, McGeorge School of Law: Scholarly Commons
1
University of the Pacific: Scholarly Commons
1
Wageningen UR (University & Research Centre): Digital Library
1
Washington State University: WSU Libraries Digital Collections
1
Wisconsin Historical Society: Turning Points in Wisconsin History
1
Zenodo
1