Very few spiritauls were collected in the antebellum days. The first book of spirituals, William Francis Allen, Charles Pickard Ware and Lucy McKim Garrison's Slave Songs of the United States, was published in 1867. A good Alabama collection is "Honey in the Rock": The Ruby Pickens Tartt Collection of Religious Folk Songs from Sumter County, Alabama, edited by Olivia and Jack Solomon (Mercer University Press, 1991; texts only), with a comprehensive annotated bibliography, but it's a 20th-century collection.