Hi, Stan - I think most of the usual civil rights songs are indexed in this thread: Gospel Origins - Civil Rights and Labor Songs (click).
The absolute best songbook of Civil Rights songs is Sing for Freedom: the Story of the Civil Rights Movement Through Its Songs edited by Guy and Candie Carawan and published by Sing Out! in 1992. You can get the book and/or a companion CD at http://www.singout.org/. There's a two-CD collection of the best of the civil rights songs called Voices of Civil Rights, on the Smithsonian Folkways label.
-Joe Offer-