General highway map, Montgomery County, Pennsylvania / prepared by Pennsylvania Department of Transportation, Bureau of Transportation Planning Statistics in cooperation with U.S. Department of Transportation, Federal Highway Administration
Scale approximately 1:63,360 ; polyconic projection (W 75°41ʹ47ʺ--W 75°00ʹ54ʺ/N 40°26ʹ49ʺ--N 39°58ʹ37ʺ).
Note
Relief shown by spot heights. "1978." "State route numbers are current as of October, 1988." "Culture features as of 1976." "Type 10 General highway map Montgomery County Pennsylvania 46." Includes location map and notes.