Collection
Eighteenth Century Collections Online / ECCO
2,341
Springer Book Archives -2004
1,045
Springer eBooks 2005-
986
Directory of Open Access Books
81
OAPEN
12
Cambridge Books Online
9
Making of the Modern World
5
Editoria Italiana Online
4
Oxford University Press
4
DeGruyter MPG Collection
3
Nomos
3
Standards and Norms (Beuth)
3
Wiley Online Books
2
Digi20
1
Elsevier eBook collection Mathematics
1
JSTOR Open Access Books
1
National Center for Biotechnology Information
1
O'Reilly
1