Keywords
- Easter1
- Ephemerides1
- Fifteenth century1
- Finding tabs1
- Germany1
- Germany--Cologne1
- Gothic scripts1
- Gregorian chants1
- Gregorian chants--Manuscripts1
- Inscriptions1
- Kölner Dom1
- Manuscripts, European1
- Manuscripts, Latin (Medieval and modern)1
- Marginalia1
- Massachusetts--Boston1
- Monastic libraries1
- Monasticism and religious orders1
- Monasticism and religious orders--Rules1
- Perpetual calendars1
- Prayers and devotions1