Collection
Directory of Open Access Books
795
Digi20
357
OAPEN
167
Eighteenth Century Collections Online / ECCO
146
Primary Sources for Slavic Studies
13
Making of the Modern World
11
Springer eBooks 2005-
2
DeGruyter MPG Collection
1
JSTOR Open Access Books
1
National Center for Biotechnology Information
1
O'Reilly
1