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Combine unloading crops into a wagon, rear close-up view, 1955

In Washington County, Iowa, a combine unloads crops into a wagon pulled by a tractor, in a rear close-up view.

Combine unloading crops into a wagon, rear close-up view, 1955

In Washington County, Iowa, a combine unloads crops into a wagon pulled by a tractor, in a rear close-up view.

Dr. Bockhop and students observing a tillage system with a model tractor, 1957

Dr. Clarence Bockhop (left) and two students observe a plain tillage linkage system with a model tractor.

Dr. Bockhop and students observing a tillage system with a model tractor, 1957

Dr. Clarence Bockhop (left) and two students observe a plain tillage linkage system with a model tractor.

Farm safety problem of child riding on the side of a moving tractor, 1953

Little Sorenson rides on a tractor by standing on the side with Irving Sorenson driving, showing a farm safety issue.

Farm safety problem of child riding on the side of a moving tractor, 1953

Little Sorenson rides on a tractor by standing on the side with Irving Sorenson driving, showing a farm safety issue.

Farmer unloading crops from combine to wagon, 1955

A farmer watches his combine unload crops into the adjacent wagon pulled by a tractor, in Washington County, Iowa.

Farmer unloading crops from combine to wagon, 1955

A farmer watches his combine unload crops into the adjacent wagon pulled by a tractor, in Washington County, Iowa.

Four students studying a tractor equipped with a seed spreader, 1957

Four students study a piece of farm equipment, a tractor equipped with a seed spreader.

Four students studying a tractor equipped with a seed spreader, 1957

Four students study a piece of farm equipment, a tractor equipped with a seed spreader.

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