Collection
Springer Book Archives -2004
146
Springer eBooks 2005-
78
National Center for Biotechnology Information
26
O'Reilly
8
Eighteenth Century Collections Online / ECCO
6
OAPEN
2
Cambridge Books Online
1
Directory of Open Access Books
1
Edward Elgar eBook Archive
1
OECD Books and Papers
1
World Bank E-Library Archive
1