2017年04月 / Mesoamerican calendars Wikipedia
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Calendar Reforms Months Years
2017年04月14日(金)
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During what period did the calendar devised?
During what period did the calendar first introduced?
In which period was the agenda come into existence?
At what time was the calendar firstly devised?
During what period was the timetable initially envisioned?
When did the timetable initially introduced?
At what time did the calendar creation?
At what time did the timetable emerge for the first time?