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Laboratory cupboard, 1938

This view inside a cupboard shows bottles and glassware filled with various substances.

Laboratory, 1938

This lab contains various pieces of equipment. A brick table is in the foreground. A substance is flowing on the floor.

Equipment parts, 1939

Seven equipment parts are displayed.

Self-propelled combine harvesting crops, rear view showing stalk wastes, 1955

The rear view of a self-propelled combine leaving behind stalk waste of crops being harvested in Washington County, Iowa.

Self-propelled combine harvesting crops, right rear view showing grain dust, 1955.

Shown from the right rear, a self-propelled combine takes down crops in Washington County, Iowa, while simultaneously harvesting the grain in a cloud of dust.

Self-propelled combine harvesting crops, right rear view showing crop stalks left behind, 1955

Shown from the right rear, a self-propelled combine harvests crops in Washington County, Iowa, leaving behind shreds of unwanted crop stalks.

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