Other Institutions
Digital scans of many of the items from Oberlin's Anti-Slavery Collection are openly accessible at the Internet Archive. The Oberlin College Library Anti-Slavery Collection was created from the microfiche set.
Also see:
Samuel J. May Anti-slavery Collection at Cornell University.
Yale Slavery and Abolition Portal
Anti-Slavery Collection of Boston Public Library
Voyages: The Trans-Atlantic Slave Trade Database [via Emory University]