Collection
O'Reilly
550
Directory of Open Access Books
258
Springer eBooks 2005-
258
Springer Book Archives -2004
159
Eighteenth Century Collections Online / ECCO
22
OAPEN
17
Cambridge Books Online
4
Elsevier ScienceDirect eBooks
4
National Center for Biotechnology Information
3
Wiley Online Books
2
ACS Symposium Series
1
Elsevier eBook collection Mathematics
1
Emerald Business, Management and Economics eBook Collection Archive
1
MIT Press eBook Archive
1
RSC eBook Collection 1968-2009
1