Collection
Directory of Open Access Books
446
National Center for Biotechnology Information
201
OAPEN
92
Making of the Modern World
43
Eighteenth Century Collections Online / ECCO
22
Springer eBooks 2005-
15
Digi20
10
Nomos
9
JSTOR Open Access Books
7
JSTOR Books
2
Mohr Siebeck eBooks
2
Springer Book Archives -2004
2
Cambridge Books Online
1
Primary Sources for Slavic Studies
1