Collection
Eighteenth Century Collections Online / ECCO
14
Directory of Open Access Books
11
Making of the Modern World
4
Cambridge Books Online
3
OAPEN
3
Oxford University Press
3
Springer Book Archives -2004
3
Springer eBooks 2005-
3
Digi20
2
Duncker & Humblot eBooks 2007-
1
JSTOR Open Access Books
1
World Bank E-Library Archive
1