Ohio-Pennsylvania, Youngstown quadrangle [cartographic material] / United States Department of the Interior, Geological Survey ; H.M. Wilson, Geographer, Frank Sutton in charge of section
Scale 1:62,500 ; Polyconic projection (W 80°45ʹ--W 80°30ʹ/N 41°15ʹ--N 41°00ʹ).
Note
Relief shown by contours and spot heights. "1906." "Surveyed in 1905-1906." "Topography by D.C. Harrison, J.H. Jennings, and A.C. Roberts." "This map reprinted without change. For later and more detailed surveys see 1:24 000 scale maps of..." 1958 reprint.