Steam-powered tractors have been around since the mid-1800s, but it was the internal combustion models of the early 20th century that truly revolutionized the world of agriculture. Weary draft animals and overworked farmers suddenly got an enormous helping hand in their never-ending struggle to plow large spreads of land and pull heavy loads from field to field. Celebrate the beauty of tractors in both function and form in this one-of-a-kind calendar.