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 all of a sudden 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 this one-of-a-kind wall calendar.