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Laboratory cupboard, 1938

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

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.

Laboratory, 1938

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

Operation of the pilot plant fractional distillation column, 1951?

Four researchers are participating in the operation of the pilot plant fractional distillation column.

Operation of the pilot plant fractional distillation column, 1951?

Four researchers are participating in the operation of the pilot plant fractional distillation column.

Research equipment, 1937

A large Reeves tank rotated by pulleys is on the left. Two other cylindrical drums are in the background.

Research equipment, 1937

A large Reeves tank rotated by pulleys is on the left. Two other cylindrical drums are in the background.

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, 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.

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