Content Provider
Project Gutenberg (PG)
38
University of Michigan: Digital Collections
16
norden (Nordic Council of Ministers): Publications (DiVA)
16
Doria (National Library of Finland)
10
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
5
OLAC: Open Language Archives Community
5
Theseus.fi (Open Repository of the Universities of Applied Sciences)
4
JYX - Jyväskylä University Digital Archive
3
Natural Resources Institute Finland: Jukuri
3
DataCite Metadata Store (German National Library of Science and Technology)
2
Hathi Trust Digital Library
2
Aalto University Publication Archive (Aaltodoc)
1
Norwegian Institute for Nature Research: Brage NINA
1
University of Vienna: Phaidra
1