Collection
Directory of Open Access Books
186
O'Reilly
5
Digi20
4
Henry Stewart Talks
4
Eighteenth Century Collections Online / ECCO
2
Making of the Modern World
2
Mohr Siebeck eBooks
2
OAPEN
2
ACS Symposium Series
1
MIT Press eBook Archive
1
Netlibrary
1
Oxford University Press
1
World Bank E-Library Archive
1