Topographic map of the Mammoth Cave National Park, Kentucky : surveyed in 1930 / United States, Department of the Interior, Geological Survey ; topography by R.R. Monbeck [and others].
Scale 1:31,680 ; polyconic projection (W 86°17ʹ00ʺ--W 86°00ʹ00ʺ/N 37°17ʹ00ʺ--N 37°07ʹ00ʺ).
Note
Relief shown by contours and spot heights. "Contour interval 10 feet. Datum is mean sea level." "Control by U.S. Geological Survey and Corps of Engineers, U.S. Army." "M R 3026." LC copy rubber-stamped on recto "Property of Hammond Inc., Editorial Dept., date acquired Dec. 13 1962."