Collection
Directory of Open Access Books
1,524
Springer Book Archives -2004
1,130
RSC eBook Collection 1968-2009
844
Wiley Online Books
595
Landolt-Börnstein
398
Eighteenth Century Collections Online / ECCO
295
Springer eBooks 2005-
142
ACS Symposium Series
83
National Center for Biotechnology Information
41
OAPEN
13
Standards and Norms (DIN Media)
13
DeGruyter MPG Collection
9
ACS Advances in Chemistry
5
O'Reilly
4
Elsevier ScienceDirect eBooks
3
Cambridge Books Online
2
JSTOR Open Access Books
2
MIT Press eBook Archive
2
Oxford University Press
2
Editoria Italiana Online
1