Here are a couple of the best. (OPINION, of course!)

The Land of Yahoe: Children's Entertainments from the Days before Television by Various Artists on Rounder 8041. The link takes you to the Rounder description of the 29 cuts on the CD.

Doc Watson Sings Songs For Little Pickers. Information from CDNow, including RA clips for all the songs. (They also have a few sound clips for my first choice, just enter Yahoe as an album title search)