Content Provider
Caltech Authors (California Institute of Technology)
2
Cambridge University Press
4
Canadian Science Publishing
2
DataCite
2
DataCite Metadata Store (German National Library of Science and Technology)
3
Defense Technical Information Center: DTIC Technical Reports database
3
Digital.CSIC (Spanish National Research Council)
1
NASA Technical Reports Server (NTRS)
2
Oxford University Press (via Crossref)
2
Purdue University: e-Pubs
1
Theses Canada/Thèses Canada (Library and Archives Canada)
2
USGS Science Data Catalog (via DataONE)
14
University of British Columbia: cIRcle - UBC's Information Repository
1
University of Calgary Journal Hosting
4
University of California: eScholarship
2
University of Nebraska-Lincoln: DigitalCommons@UNL
3
University of North Texas: UNT Digital Library
1
University of Washington, Seattle: Digital Collections
1
Unknown
6
VTechWorks (VirginiaTech)
1
Washington Rural Heritage (Washington State Library)
1
Washington State Library: Digital Collections and Resources
1
Wiley Online Library
2
Zenodo
1