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| REFERENCE/RESOURCE (R) | |
| Ra | General Reference |
| Rb | Material On or By Musicians |
| Rby | Material On or By Musicians Anthology |
| Rc | Music Appreciation, Listening & Analysis (Text) |
| Rcs | Science in Music - Acoustics, Psychology |
| Rd | General History of Music |
| RdCh | Chronological History of Music |
| Re | Music Theory |
| Rea | Analysis (Staff) |
| Rec | Composition, Arranging, Improvisation, Orchestration |
| Ref | Form - Sonata, Concerto, Symphony, etc. |
| Ret-1 | Theory - Level 1 |
| Ret-2 | Theory - Level 2 including Tranposition |
| Ret-3 | Theory - Level 3 - Counterpoint |
| Rg | Hymnals |
| Ri | Memorabilia (Posters, Programs, Pictures, etc.) |
| Rk | The Etude Magazine |
| Rl | Movie Material |
| Rlc | Silent Movie Cue SheetsRlm |
| Rlmi | Silent Movie Instrumental Parts |
| Rn | Books On Instruments - General |
| RnB | Books On Brass |
| RnK | Books On Keyboards |
| RnKa | Books On Piano - Design, Tuning, etc. |
| RnKa2 | Books On More Than One Piano |
| RnKat | Books On Piano Teaching/Technique |
| RnKb | Books On Organ - Design, Building, Literature |
| RnKc | Books On Harpsichord |
| RnOa | Books On Orchestra |
| RnOd | Books On Band |
| RnOc | Books On Conductors & Orchestral Management |
| RnP | Books On Percussion |
| RnS | Books On Strings - General |
| RnSa | Books On Violins |
| RnSat | Books On Violin Teaching/Technique |
| RnW | Books On Woodwinds |
| RnWa | Books On Flute |
| RnWat | Books On Flute Teaching/Technique |
| RnWb | Books On Oboe |
| RnWh | Books On Recorder |
| Ro | Books On Opera, Programs, etc. |
| Rop | Books On Operetta and Music Theater |
| Rp | Books On Dance, Drama |
| Rr | Books on Sight Reading |
| Rt | Books On Teaching, School |
| Rtc | Books On Teaching Children |
| Ru | Books On Church Music & Services |
| Rv | Books On Vocal & Choral Singing |
| Rw | Rare and Unusual Items |