During what period was the agenda originated?
When did the schedule first introduced?
In what period was the agenda come into existence?
When did the agenda firstly created?
In which period was the timetable initially imagined?
In what period was the agenda firstly introduced?
In which period did the agenda generation?
When did the calendar come about for the first time?
Exploring the history and evolution of Advent calendars NPR
- 04/13/01:39
- A Brief History of Time and Calendars MacTutor History of
