Collection
Directory of Open Access Books
2,728
OECD Books and Papers
2,556
Springer eBooks 2005-
901
Springer Book Archives -2004
509
National Center for Biotechnology Information
362
JSTOR Open Access Books
245
OAPEN
236
O'Reilly
211
World Bank E-Library Archive
160
MIT Press eBook Archive
106
Oxford University Press
97
Cambridge Books Online
79
ACS Symposium Series
38
DeGruyter MPG Collection
36
Edward Elgar eBook Archive
36
Emerald Business, Management and Economics eBook Collection Archive
30
Elsevier ScienceDirect eBooks
11
Oxford Handbook Online
9
Standards and Norms (DIN Media)
8
Digi20
6
Wiley Online Books
6
Brill Nijhoff E-Books Collections 2006-2008
5
Brill Nijhoff E-Books Collections 2009-2014
5
Duncker & Humblot eBooks 2007-
3
JSTOR Books
3
ACS Advances in Chemistry
2
Bloomsbury Education and Childhood Studies
2
Editoria Italiana Online
1
Elsevier eBook collection Mathematics
1
Gale virtual reference library
1
Mohr Siebeck eBooks
1
Nomos
1
RSC eBook Collection 1968-2009
1
Springer Protocols Archive 1981-2004
1