National Geographic : 1947 May
South Dakota Farmers Plant Long Shelter Belts of Trees to Guard Fields AgainstHigh Winds-Near Mitchell Cutting and Threshing Wheat, Four Self-propelled Harvesters Move Like Monsters Across Fenceless Plains near Presho New-style combines dispensing with horses and tractors reduce two-man crews to one. Cutter bars are in front ratherthan on theside. Threshed grain isstored inbins behind the drivers; spouts pump it to wagons. Headlights are for night harvesting. As the crop matures, the mechanical army advances from south tonorth.