The SOUTHERN JOURNEY field trip 1958-60 is well documented
in two books:

America Over The Water: A Musical Journey With Alan Lomax
Shirley Collins, 2004 SaF Pub Ltd.

The Southern Journey of Alan Lomax: Words, Photographs, and Music   
Alan Lomax (Author), William Ferris (Introduction), Tom Piazza
2012, W.W. Norton & Company.

The 2nd book includes a CD, and a discography of the various
lp and cd releases of the field trip recordings.