Book excerpt: Beginning in 1914 and continuing through all major Allis-Chalmers farm tractors and crawlers built as late as 1963, this pocket-size compendium offers specifications and ratings for more than 60 models and their variants. The listings, accompanied by a selection of archival photos illustrating the tractors, include all the vital facts and figures an owner or prospective buyer needs. And the handy trim size makes it an ideal take-along reference for auctions and sales.