"Evolution of the sickle and flail, 33-horse team combined harvester, Walla Walla, Washington."From Wikimedia Commons, via Retronaut [sepia tone removed by me]
33-horsepower combine, 1902
"Evolution of the sickle and flail, 33-horse team combined harvester, Walla Walla, Washington."From Wikimedia Commons, via Retronaut [sepia tone removed by me]
