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Duluth & Iron Range Railroad Locomotive #46 (built in 1888) with log train at Endion Depot.

Ilmar Koivunen (right) with Ernest Tomberg.

Ilmar Koivunen (right) with Ernest Tomberg, 1938. Koivunen became president of the Timber Workers Union in 1937.

photograph depicting factory production of cellulose tape at 3M around 1931

Manufacture of cellulose tape, Minnesota Mining and Manufacturing Company, St. Paul.

Factory production of cellulose tape, 1931.

lithograph showing farm, houses, and rolling fields

Residence of John M. Bayard, section 26, Mount Pleasant Township, Wabasha County

Residence of John M. Bayard, section 26, Mount Pleasant Township, Wabasha County from An Illustrated Historical Atlas of the State of Minnesota, 1874.

Southdale Center, Seventieth and France, Edina.

Description: Southdale Center, Seventieth and France, Edina, ca. 1958.

"Fight Polio" poster for Sister Kenny Institute on light pole, downtown Minneapolis.

"Fight Polio" poster for Sister Kenny Institute on light pole, downtown Minneapolis. 1950.

"Human Guinea Pigs"

"Human Guinea Pigs" -- A 1945 Associated Press photo from an article about conscientious objectors' service shows Keys's subjects under study on the treadmill, toward the end of the year-long starvation project.