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Dozenal Society of America
Promoting base twelve and alternative base mathematics
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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.

Manual of the Dozen System (MODS)

Title: Manual of the Dozen System (MODS)
Author: Dozenal Society of America
Year: 1174
Subject: Basic introduction to dozenal mathematics; Churchman's metric system; tables.

This is a classic manual which was distributed to Members and interested corresponders, which contains descriptions of various basic dozenal concepts. Tables of logarithms, exponents, and fractions are included. Also includes part of Henry Churchman’s dozenal system of measure and a section offering dozenal references.

This document definitely shows its age, but still provides a useful introduction to dozenal counting and mathematics.