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/drupal/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.