Sheaves of wheat in shocks, Pennsylvania, U.S.A.

Twenty-six horse combined harvester at work, reaping, threshing and sacking, Wash., U.S.A.

Twenty-six horse combined harvester at work, reaping, threshing and sacking, Wash., U.S.A.

Evolution of sickle and flail, 33 horse team harvester, cutting, threshing and sacking wheat, Walla Walla, Washington.

Evolution of sickle and flail, 33 horse team harvester, cutting, threshing and sacking wheat, Walla Walla, Washington.

Evolution of sickle and flail, 33 horse team harvester, cutting, threshing and sacking wheat, Walla Walla, Washington.

Evolution of sickle and flail, 33 horse team harvester, cutting, threshing and sacking wheat, Walla Walla, Washington.

Evolution of the sickle and flail, 33-horse team combined harvester, Walla Walla, Washington.