Yes this collection contains several items:

1) Songs and Ballads: Folk Material and Old Favorites. (ca 1933)
2) Songs of Eastern Idaho (1950)
3) Barnyard Folklore of Southeastern Idaho (1952)
4) Typical Specimens of Vulgar Folklore, collected by Gershon Legman (1952)
5) The Folklore Trade (1952)
6) Countryside Folklore: Songs and Ballads of Bygone Times (1972)
7) Letters written to James Kenneth Larson from Austin E. Fife, Wayland D. Hand, Richard M. Dorson, Joseph Hickerson, and Sylvia Cline, from 1957 to 1972

The later Larson manuscripts are redactions, expansions, and revisions of the earliest work. Most of the song material dates dates from 1918-1933. A large collection of materials with some items not found elsewhere.