Harry Merritt, the general manager of the Allis-Chalmers Tractor Division, decided there was a large market for a row-crop tractor that could replace the horses being used on small farms. The popular ...

Like many others, I am watching the Ken Burns documentary on World War II. The third episode shows a U.S. secret weapon without noting its importance. A photograph of a farm near Luverne, Minn., ...