Collection
Springer eBooks 2005-
191
Directory of Open Access Books
143
Springer Book Archives -2004
125
O'Reilly
92
Eighteenth Century Collections Online / ECCO
74
National Center for Biotechnology Information
58
OAPEN
33
ACS Symposium Series
28
JSTOR Open Access Books
3
Standards and Norms (DIN Media)
3
Emerald Business, Management and Economics eBook Collection Archive
2
Cambridge Books Online
1
Wiley Online Books
1