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Calumet Exchange, Northwestern Bell Telephone Company, Duluth, Minnesota
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Douglas Exchange, Northwestern Bell Telephone Company, Duluth, Minnesota
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Douglas Exchange, Northwestern Bell Telephone Company, Duluth, Minnesota
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Douglas Exchange, Northwestern Bell Telephone Company, Duluth, Minnesota
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Hemlock Exchange, Northwestern Bell Telephone Company, Duluth, Minnesota
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Hemlock Exchange, Northwestern Bell Telephone Company, Duluth, Minnesota
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Lakeside Exchange, Northwestern Bell Telephone Company, Duluth, Minnesota
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New Sweden Telephone Exchange in New Sweden, Minnesota
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New Sweden Telephone Exchange in New Sweden, Minnesota
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Oxford Exchange, Northwestern Bell Telephone Company, Duluth, Minnesota
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Telephone Exchange in Windom, Minnesota
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West Duluth Telephone Exchange, Duluth, Minnesota
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Black-and-white photographs
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1940
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Telephone Stations
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University of Minnesota Duluth, Kathryn A. Martin Library, NEMHC Collections
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Nicollet County Historical Society
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Cottonwood County Historical Society
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