In which period did the agenda originated?
In which period did the agenda initially introduced?
In what period did
the timetable come into existence?
In what period did the agenda firstly created?
In which period did the agenda originally envisioned?
In what period was the timetable initially established?
In what period did the schedule inception?
In which period was the agenda come about for the first time?
The Mesoamerican Calendar article
