The evolution of calendars and how to improve them
Contributors: Pan American Union
Publisher: Govt. print. off.
Published: 1922
Place of publication: Washington
Language: eng
Number of pages: 28
Subjects: Calendars
Notes: At head of title: The Pan American union.

"By Moses B. Cotsworth."

"Reprinted from the June, 1922, issue of the Bulletin of the Pan American union."