Collection
National Center for Biotechnology Information
1,760
Directory of Open Access Books
1,425
Springer eBooks 2005-
1,394
Springer Book Archives -2004
1,318
OECD Books and Papers
151
Eighteenth Century Collections Online / ECCO
92
Karger eBooks Collection 1997-2013
73
OAPEN
53
O'Reilly
47
MIT Press eBook Archive
11
ACS Symposium Series
9
JSTOR Open Access Books
9
Karger eBooks Collection 1997-2009
5
DeGruyter MPG Collection
4
Oxford University Press
4
Wiley Online Books
4
Edward Elgar eBooks Collection Business & Economics
3
Elsevier ScienceDirect eBooks
3
Making of the Modern World
3
Cambridge Books Online
2
Edward Elgar eBook Archive
2
Emerald Business, Management and Economics eBook Collection Archive
2
ACS Advances in Chemistry
1
Digi20
1
Elsevier eBook collection Mathematics
1
JSTOR Books
1
Nomos
1
Oxford Handbook Online
1