Collection
Directory of Open Access Books
425
National Center for Biotechnology Information
225
Springer eBooks 2005-
119
Springer Book Archives -2004
91
Henry Stewart Talks
61
Karger eBooks Collection 1997-2013
30
Eighteenth Century Collections Online / ECCO
14
ACS Symposium Series
7
World Bank E-Library Archive
2
MIT Press eBook Archive
1
O'Reilly
1
OAPEN
1
Wiley Online Books
1