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Agricultural engineering student using an engineer's transit, 1957

Agricultural engineering student Kent Mitchell uses an engineer's transit in soil and water conservation work.

Agricultural engineering student using an engineer's transit, 1957

Agricultural engineering student Kent Mitchell uses an engineer's transit in soil and water conservation work.

Band saw, 1934

Several men are occupied in the construction of wooden structures. Their activities include: sawing, hammering and filing. A large band saw is at one side of the room. Its large wheels and most of the blade are enclosed in a wire safety enclosure.

Band saw, 1934

Several men are occupied in the construction of wooden structures. Their activities include: sawing, hammering and filing. A large band saw is at one side of the room. Its large wheels and most of the blade are enclosed in a wire safety enclosure.

Binders machine room, 1906

A group of individuals are working on machinery in the Binders machine room.

Binders machine room, 1906

A group of individuals are working on machinery in the Binders machine room.

Checking a tractor carburetor, 1947

Four men listen to an instructor explaining a tractor carburetor. The group of men are standing next to a John Deere tractor.

Checking a tractor carburetor, 1947

Four men listen to an instructor explaining a tractor carburetor. The group of men are standing next to a John Deere tractor.

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.

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