Content Provider
Defense Technical Information Center: DTIC Technical Reports database
40
MDPI Open Access Publishing
12
Unknown
5
Utah State University: DigitalCommons@USU
3
DataCite
2
DataCite Metadata Store (German National Library of Science and Technology)
2
Digital Repository of Scientific Institutes (RCIN)
1
Edith Cowan University (ECU, Australia): Research Online
1
Michigan Technological University: Digital Commons @ Michigan Tech
1
Old Dominion University: ODU Digital Commons
1
South Dakota State University (SDSU): Open PRAIRIE (Public Research Access Institutional Repository and Information Exchange)
1
Southern Illinois University Carbondale: OpenSUIC
1
The University of Maine: DigitalCommons@UMaine
1
University of Southern Queensland: USQ ePrints
1
Érudit.org (Université Montréal)
1