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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 Dozenal System

Title: Manual of the Dozenal System
Author: Dozenal Society of America
Year: 1200
Subject: A short but thorough introduction to dozenals for those really interested in learning and using them
http://www.dozenal.org/../sites_bck/default/files/DSA_mods_rev.pdf
Clocking in at four dozen pages, this work is the updated version of the original Manual of the Dozen System published in 1174 (1960). (This original version is available here.) Fully updated for the digital world, this document is a great handbook for those wishing to learn and really use dozens. Available for sale at Lulu.
© 11E9-1205 (decimal 2013-2021). The Dozenal Society of America. Contact Us
Creative Commons License
This website and the documents on it are licensed under a Creative Commons Attribution 3.0 Unported License.
Numeration on this site is in dozenal (also called duodecimal, or base twelve), using "X" for ten and "E" for eleven.
0 1 2 3 4 5 6 7 8 9 X E 10 11 12 13 14 15 16 17 18 19 1X 1E 20 21 22...
PDF documents may use a Dwiggins stylized "X" and "E" or the Pitman inverted "2" and "3".
The Humphrey point, or semicolon, is used for fractional parts; e.g., "0;6 = 0.5."