The Cello Etude System published by C. Harvey Publications.
Part 0: Beginning Studies Duet Book
The Cello Etude System presents both rare and classic etudes, interspersed with newly written material, providing cello teachers and students with a library of essential resources for teaching and learning cello. Recognizing that students learn at different speeds, The Cello Etude System books allow cellists to learn at either a relaxed pace or an accelerated pace.
With works by Schroeder, Nolck, Werner, Davidov, Romberg, and more, this book has a huge array of rare studies for beginning cello. Where duet parts were not already written, Myanna Harvey has composed cello accompaniment parts so that a teacher can play along with the student on every etude. This is especially helpful in working on rhythm and early chamber music skills!