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Figure This!

Glenn, W., and D. Johnson. Fun with Mathematics. Sacramento, CA: California State Department of Education, 1960.

Rand McNally & Company. The Real Mother Goose. Eau Claire, WI: E.M. Hale and Co., 1953.

The Old Farmers Almanac. Dublin, NH: Yankee Publishing Inc., 1999.

 

Calendars and Their History:
http://charon.nmsu.edu/~lhuber/leaphist.html

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