Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
117
Unknown
12
University of Michigan: Digital Collections
9
Frontiers: Figshare
6
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
6
Digital.CSIC (Spanish National Research Council)
4
Doria (National Library of Finland)
3
Digital Repository of Scientific Institutes (RCIN)
1
SAIC Digital Collections (School of the Art Institute of Chicago)
1
The Library of Congress: American Memory
1
University of Alberta: Era - Education and Research Archive
1