Scale 1:500,000. 1 in. = approximately 8 miles ; Lambert conformal conic projection, based on standard parallels 33° and 45° (W 90°18ʹ00ʺ--W 81°38ʹ00ʺ/N 36°40ʹ00ʺ--N 34°58ʹ00ʺ).
Note:
Relief shown by contours and spot heights. Contour interval 200 feet. "Compiled in 1957." Includes legend, source data, and population key.