Areal geology, Montana, Livingston sheet / U.S. Geological Survey, J.W. Powell, Director ; Henry Gannett, Chief Topographer ; A.H. Thompson, Geographer in charge ; triangulation by E.M. Douglas and J.H. Renshawe ; topography by Northern Transcontinental SGeological Survey (U.S.)[1893]"Contour interval 200 feet."cartographic