Collection
Digi20
9
Directory of Open Access Books
127
Edward Elgar eBooks Collection Business & Economics
1
Eighteenth Century Collections Online / ECCO
5
Making of the Modern World
7
Mohr Siebeck eBooks
2
National Center for Biotechnology Information
97
Nomos
3
OAPEN
37
Springer Book Archives -2004
4
Springer eBooks 2005-
4