Collection
O'Reilly
44
International Monetary Fund
21
Making of the Modern World
16
Directory of Open Access Books
7
ACS Symposium Series
4
MIT Press eBook Archive
4
Netlibrary
3
Eighteenth Century Collections Online / ECCO
2
OAPEN
2
ACS Advances in Chemistry
1
Editoria Italiana Online
1
Oxford University Press
1
Primary Sources for Slavic Studies
1
World Bank E-Library Archive
1