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Duluth policemen, group photo. Oscar G. Olson (August 9, 1887 – December 1, 1941), Police Lieutenant, second from left.
Dindorf, William Edward. History of the Duluth Police Department. Published by and for the Benefit of the Duluth Policemen's Training School. (Duluth: Duluth Policemen's Training School, 1920), 14.
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