Collection
Directory of Open Access Books
1,544
Springer eBooks 2005-
597
Springer Book Archives -2004
566
Eighteenth Century Collections Online / ECCO
278
National Center for Biotechnology Information
202
OAPEN
15
Springer Protocols Archive 1981-2004
9
Cambridge Books Online
2
Wiley Online Books
2
ACS Symposium Series
1
DeGruyter MPG Collection
1
Mohr Siebeck eBooks
1
O'Reilly
1