Collection
Eighteenth Century Collections Online / ECCO
20
Springer eBooks 2005-
19
Springer Book Archives -2004
13
Directory of Open Access Books
8
Making of the Modern World
6
Cambridge Books Online
5
JSTOR Open Access Books
5
OAPEN
5
Netlibrary
3
Nomos
2
Anthropology Online
1
Digi20
1
Editoria Italiana Online
1
Music Online Reference
1
O'Reilly
1
Oxford University Press
1