Topographic Sheets. Muskingum County, Ohio, [Topography of] from U. S. Geological Survey topographic atlas sheets, surveyed 1907-09 in cooperation with Ohio [lat. 39° 45′ 40″-40° 10′. long. 81° 44′-82° 14′ 15″]. Scale 1: 62.500, contour interval 20 ft.