References - The Roman Calendar from Numa to Constantine - Wiley Online Library
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German-American Resources at the Max Kade Institute — Anonymous / Unknown Creators – Max Kade Institute for German-American Studies – UW–Madison
May 1982 Calendar (PDF Word Excel)
Calends: The Adoption and Use of the Julian Solar Calendar in Ancient Rome – Brewminate: A Bold Blend of News and Ideas
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Chapter 3 The Origin(s) of the Medieval Calendar Tradition in the Latin West in: Calendars in the Making: The Origins of Calendars from the Roman Empire to the Later Middle Ages
Kalender 1963 ⬅️ Jahreskalender — Kalender12.de
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