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Students observing a tractor cultivating a field, 1957

Thirteen students observe someone driving a tractor and cultivating a field.

Students observing a tractor cultivating a field, 1957

Thirteen students observe someone driving a tractor and cultivating a field.

Professor showing three students the inner mechanics of a John Deere tractor, 1957

A professor shows three students the mechanics of a John Deere tractor that has been flipped open to show the inside.

Professor showing three students the inner mechanics of a John Deere tractor, 1957

A professor shows three students the mechanics of a John Deere tractor that has been flipped open to show the inside.

Instructor teaching a group of students about a tractor, 1957

An instructor explains the front mechanics of a tractor to six students in a laboratory with five other tractors.

Instructor teaching a group of students about a tractor, 1957

An instructor explains the front mechanics of a tractor to six students in a laboratory with five other tractors.

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.

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.

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