In what period was the schedule invented?
In which period did the calendar initially developed?
In what period did the schedule arise?
In what period was the agenda firstly invented?
In which period did the schedule firstly conceived?
In which period was the timetable firstly devised?
In what period did the schedule creation?
When did the schedule come about for the first time?
How Did People Count Years Before BC and AD Medium
- 04/13/01:39
- The Mesoamerican Calendar Ancient Shared Time Keeping
