Collection
Directory of Open Access Books
40
Springer eBooks 2005-
24
National Center for Biotechnology Information
16
Springer Book Archives -2004
15
Eighteenth Century Collections Online / ECCO
14
OAPEN
9
Editoria Italiana Online
3
OECD Books and Papers
3
Digi20
1
JSTOR Open Access Books
1
Karger eBooks Collection 1997-2013
1
MIT Press eBook Archive
1
O'Reilly
1