Columbia subject headings:
Calendar reform--History--To 1500.
Church calendar--Early works to 1800.
Easter--Early works to 1800.
Reinherus, Paderbornensis, active 12th century.
Harvard subject headings:
Calendar reform--History--To 1500.
Church calendar--Early works to 1800.
Easter--Early works to 1800.
Reinherus, Paderbornensis, active 12th century.
Princeton subject headings:
Calendar reform--History--To 1500.
Church calendar--Early works to 1800.
Easter--Early works to 1800.
Reinherus, Paderbornensis, active 12th century.