A Perpetual Calendar in One Step
GENUKI: Dates of Easter Sunday and Perpetual Calendar, 1550-2049 (for Great Britain and the Colonies)
Notre Dame Archives - Perpetual Calendar
What's valuable (and different) about this perpetual calendar is that it has a calculator which enables you to find appropriate years when you know only the day of the week, the date, and the month.
Perpetual calendar, including dates for holidays and leap years.
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