Collection
Directory of Open Access Books
294
National Center for Biotechnology Information
81
Eighteenth Century Collections Online / ECCO
48
ACS Symposium Series
25
Henry Stewart Talks
18
Making of the Modern World
7
World Bank E-Library Archive
5
OAPEN
4
Cambridge Books Online
3
International Monetary Fund
2
JSTOR Open Access Books
2
O'Reilly
2
Oxford University Press
2
ACS Advances in Chemistry
1
Digi20
1
MIT Press eBook Archive
1
Oxford Handbook Online
1