Adler, Irving.
The calendar / [by] Irving and Ruth Adler. - New York : Day, 1967. - 48 p. : ill. - Their The Reason why books .
A history of the calendar from the primitive concepts of measuring time used by ancient civilizations to the Gregorian calendar invented in 1582 still used today.
67023865
Calendars.
529
The calendar / [by] Irving and Ruth Adler. - New York : Day, 1967. - 48 p. : ill. - Their The Reason why books .
A history of the calendar from the primitive concepts of measuring time used by ancient civilizations to the Gregorian calendar invented in 1582 still used today.
67023865
Calendars.
529