Content Provider
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
14
Hathi Trust Digital Library
2
University of Michigan: Digital Collections
2
DataCite Metadata Store (German National Library of Science and Technology)
1
Digital Repository of Scientific Institutes (RCIN)
1
LIBDOC - Publikationsserver der Westsächsischen Hochschule Zwickau
1
Publication Server of Goethe University Frankfurt am Main
1
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
1