In that case, Gary, Rounder records puts out the complete Victor recordings of the Carter Family. The early ones don't have yodeling in them. They start to yodel from about 1928, when the Victor agent for country music urged them to do it because of the success of Jimmie Rodgers.
The same company also puts out some disks/cassettes by Jimmie Rodgers. They say he is the one who introduced yodeling into western music.
Rounder has a website at:
I walked in while someone was playing an early Gene Autry piece once and thought it was Jimmie Rodgers until I heard more and heard the accompanyment. I think he started out with Rodgers as a model.
Give a listen to Jean Shephard's recording of "Second Fiddle". She yodels an entire stanza--and sounds good too! The recording is from the Nashville school in the 60s (or maybe early 70s).