In which period did the agenda originated?
In which period was the agenda initially introduced?
During what period did the timetable come into existence?
When did the schedule initially devised?
In which period did the agenda initially envisioned?
During what period did the calendar firstly devised?
During what period was the calendar generation?
In which period was the schedule arise for the first time?
Exploring the history and evolution of Advent calendars NPR
- 04/13/01:39
- The History Of Advent Calendars The Fact Site
