Manuscript
| Id ms | MMB_21691 |
| Shelfmark | 21691 |
| Title | Graduál mladoboleslavský (Janíčka Zmilelého z Písku) |
| Lang | lat |
| Dating | before 1505 |
| Material | perg |
| Folies | 409 |
| Ilum | il. |
| Music | music |
| Script | libraria gothica |
| Binding | Renaissance |
| Origin | Praha |
| Provenance | Mladá Boleslav, St Mary's Church? |
| Digitized | https://www.manuscriptorium.com/apps/index.php?direct=record&pid=AIPDIG-OMMB__INV_C_21691_44TGV4A-cs |
| Catalog | Brodský – Šumová 2023, 229 |
| Notes | Chorální rhombická notace ve čtyřlinkové osnově |