United States Department of the Interior Geological SurveyState of Minnesota, Department of AdministrationSegar, Raymond W., 1914-2000Hartley Lake quadrangle topographic map (N4730-W9315/7.5) featuring handwritten notations by Ray Segar in pencil and red ink regarding logging railroad lines and camps in the area between Lawrence Lake East and Horsehead Lake. The hand written notations include information on the following logging camps noted with 'C'.JPEGengUnited States Department of the Interior Geological SurveyPublicCommunicationHartley Lake Quadrangle, Minnesota-Itasca County, 1971: 7.5 Minute Series Orthophoto Map (Topographic) MapMapsMinnesota--HartleyMinnesota1971University of Minnesota