United States Department of the Interior Geological SurveySegar, Raymond W., 1914-2000Isaac Lake quadrangle topographic map (N4737.5-W9200/7.5) featuring handwritten notations by Ray Segar in pencil, red and black ink regarding logging railroad lines and camps in the area between Babbitt and Embarrass. The hand written notations include information on the following logging camps noted with 'C'.JPEGengUnited States Department of the Interior Geological SurveyPublicCommunicationIsaac Lake Quadrangle, Minnesota-St. Louis County, 1949: 7.5 Minute Series (Topographic) MapMapsMinnesota--St. Louis CountyMinnesota1949University of Minnesota