McGrath, as you can imagine, with the project on spirituals going full tilt boogie, I too am cruising around a lot of sites of that era looking for material on all of the spirituals. I will keep my eye out.
If you have any bookmarks for us, please share them-- there's a thread called Links on Spirituals where you could toss 'em. Eventually all those links will get edited together and inserted in the permathread. Don't worry about making clickies-- I can automate them when I edit it all together.