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

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

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 Samuel Calvin's home on North Clinton Street, Iowa City, Iowa

Professor Samuel Calvin's home on North Clinton Street, Iowa City, Iowa

Professor Samuel Calvin and class, Solon, Iowa, 1900

Professor Samuel Calvin and class, Solon, Iowa, 1900

Professor Samuel Calvin and class, Solon, Iowa, 1900

Professor Samuel Calvin and class, Solon, Iowa, 1900

Professor Samuel Calvin and class at the state quarry, North Liberty, Iowa, April 22, 1899

Professor Samuel Calvin and class at the state quarry, North Liberty, Iowa, April 22, 1899

Professor Samuel Calvin and class at the state quarry, North Liberty, Iowa, April 22, 1899

Professor Samuel Calvin and class at the state quarry, North Liberty, Iowa, April 22, 1899

Professor Samuel Calvin and class at Solon, Iowa, 1900

Professor Samuel Calvin and class at Solon, Iowa, 1900

Professor Rockwood lecturing, The University of Iowa, 1930s

Professor Rockwood lecturing, The University of Iowa, 1930s

Professor Raymond and performers in a radio drama, The University of Iowa, 1924

Professor Raymond and performers in a radio drama, The University of Iowa, 1924

The University of Iowa radio station started as WHAA on June 26, 1922. Its call letters were changed to WSUI on January 29, 1925.