Collection
Directory of Open Access Books
1,623
Eighteenth Century Collections Online / ECCO
1,562
OECD Books and Papers
1,471
O'Reilly
688
National Center for Biotechnology Information
199
OAPEN
166
Edward Elgar eBooks Collection Business & Economics
96
Edward Elgar eBook Archive
36
World Bank E-Library Archive
4
Emerald Business, Management and Economics eBook Collection Archive
3
JSTOR Open Access Books
3
Mohr Siebeck eBooks
3
Cambridge Books Online
1
Nomos
1
Oxford University Press
1