Gamse, Albert. 90 tri-chord tunes : : an instructive introduction to basic chords and progressions / [electronic resource] / compiled and arranged by Albert Gamse.. — Carlstadt, N.J. : : Century Music Pub. Co.,, 1972.. — 128 p. : : ill. ; 30 cm. — (Most popular series ;) v. 8.
Piano--Instruction and study. Piano--Chord diagrams.