Collection
Directory of Open Access Books
233
O'Reilly
62
Springer eBooks 2005-
58
National Center for Biotechnology Information
21
Springer Book Archives -2004
20
Wiley Online Books
8
Eighteenth Century Collections Online / ECCO
7
ACS Symposium Series
3
JSTOR Open Access Books
2
MIT Press eBook Archive
2
OAPEN
2