Collection
Directory of Open Access Books
2,122
OAPEN
194
National Center for Biotechnology Information
118
Making of the Modern World
72
Springer eBooks 2005-
31
Eighteenth Century Collections Online / ECCO
28
Primary Sources for Slavic Studies
19
Digi20
16
JSTOR Open Access Books
15
O'Reilly
13
Nomos
6
Springer Book Archives -2004
6
DeGruyter MPG Collection
5
MIT Press eBook Archive
5
Cambridge Books Online
1
Elsevier eBook collection Mathematics
1
JSTOR Books
1
Oxford University Press
1
beck-elibrary
1