The calendar
By: [by] Irving and Ruth Adler.
Contributors: Adler, Ruth, joint author.
Series: Their The Reason why books
Publisher: John Day Co.
Published: 1967
Place of publication: New York
Language: eng
Number of pages: 48
Subjects: Calendar -- Juvenile literature.; Calendar.
Description: 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.