It's just the same today: The Barnicle-Cadle Field Recordings from Eastern Tennessee and Kentucky, 1938-1949.
Edited by Mary Elizabeth Barnicle and Tillman Cadle. Tennessee Folklore Society, 1986. LP. (Includes recordings from the collection.)
“Anglo-American Traditional Music.” The Journal of American Folklore, Vol. 103, No. 408. Apr. - Jun., 1990, pp. 193-205. (Includes extensive information on Mary Elizabeth Barnicle and Tilman Cadle.)
Malone, Bill C. “Recordings from the Tennessee Folklore Society.” Appalachian Journal, Vol. 15, No. 2. Winter 1988, pp. 181-187.