The Cornell University Libraries have digitized the Samuel J. May Anti-Slavery Collection, a rich collection of material dealing with all aspects of the anti-slavery movement in the United States.
According to the Cornell site,
"Numbering over 10,000 titles, May's pamphlets and leaflets document the anti-slavery struggle at the local, regional, and national levels. Much of the May Anti-Slavery Collection was considered ephemeral or fugitive, and today many of these pamphlets are scarce. Sermons, position papers, offprints, local Anti-Slavery Society newsletters, poetry anthologies, freedmen's testimonies, broadsides, and Anti-Slavery Fair keepsakes all document the social and political implications of the abolitionist movement."
Users may search/browse all of the pamphlets in the collection.