Before revision: A 7.5 minute quadrangle map covers an area of .Map Scales, Fact Sheet FS105-02, (February 2002)
After revision: Both map series were produced via photogrammetric analysis of aerial photography using stereoplotters supplemented by field surveys.A 7.5 minute quadrangle map covers an area of .Map Scales, Fact Sheet FS105-02, (February 2002)