Next time you go to an antique machinery auction, bring along this handy, easy-to-use book, The Field Guide to Vintage Farm Tractors, from Voyageur Press.

From the obscure to the obvious, more than 500 models of tractors from 27 U.S. and Canadian manufacturers are shown in full color, with brief histories, model runs and other specs. You'll find page after page of a chart titled "Model and Variations and Specifications" that provides important details for each tractor represented.

The machine pictured above had an engine similar to a Waterloo Boy. The Happy Farmer Tractor Company in Minneapolis, MN, built it around 1916, and the company made one of several three-wheeled tractors of the 1915 era. Price: 19.95 dollars plus shipping. Contact Voyageur Press Inc., Dept. FIN, 123 N. 2nd St., Stillwater, MN 55082, 800/888-9653, HYPERLINK http://www.-voyageurpress.com www.-voyageurpress.com.