No help for Mark, but I checked a stack of old kiddies lps I have, and ran across parts of sets called My First Golden Record Library, and The Golden Record Library ("for young America'). There must have been dozens in the collection, music of all kinds. Issued by Pan-Harmonic Musical Education Society, probably for schools.
Esp. interesting are the sets of folk songs, sung by a Win Strake and others. These came out 1955-60. Old standbys from Go Tell Aunt Rhody to Boll Weevil are on the two that I have out of the Folk sets.

Sorry for this digression, but I wondered if any sets like this are available on cd?