This is an interesting website organized by Spiritual Workshop, Paris. It includes a general history of the songs we sing in the Spirituals Choir and carries it forward into and through the twentieth century. You’ll also find links to more information about the songs and some of their singers.
Especially cool is the alphabetical song index. Each first line links to the lyrics of the song. In some cases more than one version is given. Most of the songs we sing are there.