Variations de concert sur un thème original : op. 1 ; &, Variations sur un thème original : op. 29 : for piano solo / Charles-Marie Widor ; [edited by Harold Fabrikant and Daniel Mitterdorfer].
"The editions presented here are based on that published by Heugel et Cie in 1867 (op. 1, plate number H. 4653) and by J. Hamelle in 1876 (op. 29, plate number J. 3428 H.)"--Page 2.