| Digest Nr | Subject and Author |
|---|
 |
| 2015.01.08.09 | Comprehensive Article About Musical Wonder House, from Douglas Henderson |
| 2001.07.08.11 | Ampico Roll Producers in Comprehensive Source List, from Karl Ellison |
| 2000.09.03.01 | MMD Hosts Comprehensive Roll Manufacturer's List, from Karl Ellison |
| 2000.05.11.02 | Comprehensive Music Producer's List Project, from Karl Ellison |
| 2000.04.21.01 | Sources of Piano Rolls - Comprehensive List Project, from Karl Ellison |
| 2000.03.31.07 | Sources of Piano Rolls - Comprehensive List Project, from Karl Ellison |
|
