Eight Fugues from J.S. Bach's Well-tempered Clavichord, with analytical expositions in colors and appended harmonic schemes by Bern. Boekelman - Bach, Johann Sebastian ; Boekelman, Bern (Boston Music Co. [u.a.], 1895)
Harmonic schemes as supplement to the colored Edition selected Fugues from J.S. Bach's Well-tempered Clavichord by Bern. Boekelman. Designed for use in Music Schools, and for self-instruction