The Levy Collection offers these details of still another version, but the sheet music image seems not to be working right now:

Title: That Big Rock-Candy Mountain.
Composer, Lyricist, Arranger: by Bill Mack.
Publication: New York: Denton & Haskins Music Pub. Co., 1595 Broadway, 1928.
Instrumentation: piano and voice; ukulele
Form of Composition: strophic with chorus
First Line: A jungle by the railroad track, where a bunch of bums were "gabbing"
First Line of Chorus: Big rock candy mountain, where the weather's always clear
Engraver, Lithographer, Artist: E. Pfeiffer, N.Y.
Advertisement: ads on back cover for Denton & Haskins Music Pub. Co. stock
Subject: Caricatures
Subject: Whistling
Subject: Dogs
Subject: Pets
Subject: Boys
Subject: Dreaming
Subject: Dialects
Call No.: Box: 157 Item: 035a