United States Department of the Interior Geological SurveySegar, Raymond W., 1914-2000Boulder Lake Reservoir NE quadrangle topographic map (N4707.5-W9200/7.5) featuring handwritten notations by Ray Segar in red ink and pencil regarding logging railroad lines and camps in the area south of Markham. The hand written notations include information on the following: Duluth, Northeastern Railroad (DNE) line.JPEGengUnited States Department of the Interior Geological SurveyPublicCommunicationBoulder Lake Reservoir NE Quadrangle, Minnesota-St. Louis County, 1957: 7.5 Minute Series (Topographic) MapMapsMinnesota--Ault TownshipMinnesota1957University of Minnesota