Collection
O'Reilly
10,084
Directory of Open Access Books
3,860
National Center for Biotechnology Information
170
OAPEN
160
Standards and Norms (DIN Media)
81
Mohr Siebeck eBooks
45
Eighteenth Century Collections Online / ECCO
34
Nomos
34
Digi20
20
Making of the Modern World
14
Springer eBooks 2005-
12
Springer Book Archives -2004
6
Ethnographic Video Online Vol. 1
3
JSTOR Open Access Books
2