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The Dozenal Society of America
The DSA is a voluntary, nonprofit education corporation, organized for the conduct of research and education of the public in the use of dozenal (also called duodecimal or base-twelve) in calculations, mathematics, weights and measures, and other branches of pure and applied science.

On Maximal Repeating Sequence of Decimal Expansions in Base-Twelve

Title: On Maximal Repeating Sequence of Decimal Expansions in Base-Twelve
Author: T. J. Gaffney
Year: 11E6
Subject: Exploring dozenal repeating fractions, especially sevenths.
http://www.dozenal.org/../sites_bck/default/files/db4b109_0.pdf

Mr. Gaffney examines the “worst case scenarios” of dozenal repeating fractional expansions, especially that associated with the sevenths.
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Numeration on this site is in dozenal (also called duodecimal, or base twelve), using "X" for ten and "E" for eleven.
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