Collection
Directory of Open Access Books
1,330
Springer Book Archives -2004
1,134
RSC eBook Collection 1968-2009
844
Wiley Online Books
595
Landolt-Börnstein
398
Eighteenth Century Collections Online / ECCO
295
Springer eBooks 2005-
139
ACS Symposium Series
83
National Center for Biotechnology Information
40
OAPEN
40
Standards and Norms (DIN Media)
13
DeGruyter MPG Collection
9
ACS Advances in Chemistry
5
Elsevier ScienceDirect eBooks
3
O'Reilly
3
Cambridge Books Online
2
JSTOR Open Access Books
2
MIT Press eBook Archive
2
Oxford University Press
2
Editoria Italiana Online
1