Content Provider
da|ra - Registration agency for social and economic data
21
DataCite Metadata Store (German National Library of Science and Technology)
4
German Aerospace Center: elib - DLR electronic library
4
Contributions to Entomology = Beiträge zur Entomologie (E-Journal)
2
Directory of Open Access Journals: DOAJ Articles
1
Doria (National Library of Finland)
1
GEO-LEOe-docs (FID GEO)
1
Georg-August-Universität Göttingen: GOEDOC
1
Munich University of Technology (TUM): mediaTUM
1
Publication Server of Goethe University Frankfurt am Main
1
The Library of Congress: American Memory
1
The Portal to Texas History (University of North Texas)
1
UNESDOC - UNESCO Digital Library
1
University of the Highlands and Islands: Research Database of UHI
1