Content Provider
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
4
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
2
Center for Jewish History: Digital Collections
1
DataCite Metadata Store (German National Library of Science and Technology)
1
Directory of Open Access Journals: DOAJ Articles
1
GEO-LEOe-docs (FID GEO)
1
Hathi Trust Digital Library
1
The Library of Congress: American Memory
1