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Counting down to Christmas A history of the Advent Calendar
During what period did the agenda invented? During what period was the timetable initially devised? During what period was the schedule come into existence? At what time was the timetable initially invented? In which period was the timetable initially envisioned? When did the agenda initially introduced? At what time did the timetable creation? When was the schedule emerge for the first time?

• 04/13/01:39
• Mesoamerican Calendars and Archaeoastronomy