Collection
National Center for Biotechnology Information
3,226
Eighteenth Century Collections Online / ECCO
859
OECD Books and Papers
343
Directory of Open Access Books
218
Springer eBooks 2005-
194
Springer Book Archives -2004
87
OAPEN
25
O'Reilly
20
Karger eBooks Collection 1997-2013
12
JSTOR Open Access Books
8
ACS Symposium Series
6
Edward Elgar eBooks Collection Business & Economics
5
Emerald Business, Management and Economics eBook Collection Archive
3
Making of the Modern World
3
Edward Elgar eBook Archive
2
Cambridge Books Online
1
Digi20
1
Ethnographic Video Online Vol. 1
1
Nomos
1
Oxford Handbook Online
1