Collection
Directory of Open Access Books
2,101
OECD Books and Papers
2,043
Eighteenth Century Collections Online / ECCO
1,586
O'Reilly
768
OAPEN
251
National Center for Biotechnology Information
200
Edward Elgar eBooks Collection Business & Economics
98
Edward Elgar eBook Archive
36
Mohr Siebeck eBooks
7
World Bank E-Library Archive
4
Emerald Business, Management and Economics eBook Collection Archive
3
JSTOR Open Access Books
3
Making of the Modern World
3
Cambridge Books Online
1
Editoria Italiana Online
1
Nomos
1
Oxford University Press
1