Book excerpt: Original ads, historic design drawings, and factory photographs tell the definitive story of the American tractor's development, mechanical innovations, groundbreaking designs, and company histories. Best-selling author Randy Leffingwell researched and photographed restored classics and one-of-a-kind experimental models from coast-to-coast to deliver the goods on American farm tractor. This is the book that started it all! Previous hardcover edition (0-87938-532-4 pub 1991) has sold a staggering 150,000!