Fifteen Easy Studies for Two Cellos, and Preparatory Studies to the High School of Cello Playing
Fifteen Easy Studies (also known as Fifteen Easy Melodic-Harmonic Etudes) for two cellos, op. 76a
Ten Grand Etudes of Moderate Difficulty (also known as Preparatory Studies to the High School of Cello Playing) Op. 76
David Popper. Edited by Martin Rummel. Published by Barenreiter.