2017年04月 / Mesoamerican calendars Wikipedia
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Counting down to Christmas A history of the Advent Calendar
2017年04月14日(金)
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When did the timetable devised?
In what period was the timetable initially established?
At what time was the timetable emerge?
When did the calendar originally devised?
In which period was the schedule firstly imagined?
When did the schedule firstly introduced?
During what period did the schedule generation?
At what time did the agenda arise for the first time?