Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
8
ArXiv.org (Cornell University Library)
4
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
3
North Dakota State University (NDSU): Digital Horizons
3
University of Nebraska-Lincoln: DigitalCommons@UNL
2
Wichita State University: SOAR (Shocker Open Access Repository)
2
Wiley Online Library (via Crossref)
2
Akademia Ignatianum w Krakowie: Czasopisma
1
DigitalCommons@CalPoly (California Polytechnic State University, San Luis Obispo)
1
Embry-Riddle Aeronautical University: ERAU Scholarly Commons
1
JSTOR (via Crossref)
1
Natural Environment Research Council: NERC Open Research Archive
1
Pepperdine University: Pepperdine Digital Commons
1
Purdue University: e-Pubs
1
Research, Society and Development (E-Journal)
1
SAGE Publications
1
Springer Nature (via Crossref)
1
The Portal to Texas History (University of North Texas)
1
The University of Maine: DigitalCommons@UMaine
1
The University of Utah: J. Willard Marriott Digital Library
1
Universitat Politècnica de Catalunya, BarcelonaTech: UPCommons - Global access to UPC knowledge
1
University of California Press (via Crossref)
1
University of North Texas: UNT Digital Library
1
Valparaiso University: ValpoScholar
1
Washington State University: WSU Libraries Digital Collections
1
Zenodo
1