O. M. · R. M. · R. Morris · R. O. Morris
| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Figured Harmony at the Keyboard: Pt. 1 | 978-0-19-321471-2 | 1933 | |
| Figured Harmony at the Keyboard: Pt. 2 | 978-0-19-321472-9 | 1933 | |
| Preparatory Exercises in Score-reading | 978-0-19-321475-0 | 1931 | Howard Ferguson · R. O. Morris |
| The Oxford Harmony: Volume 1 | 978-0-19-321491-0 | 1983 | H. K. Andrews |