Readex, a division of Newspapers.com, has released their long-awaited American Slavery Collection of books, pamphlets, ephemera, etc. The collection is fully searchable and is available at most public libraries. They do not, however, offer a subscription.
In an upcoming post, I will offer a list of local libraries near me (Clinton County, PA) that has free access to genealogy services, such as Ancestry. If your library offers access, complete the contact form and let me know!