Illinois Macomb Quadrangle Surveyed in 1912 in Cooperation with the State of Illinois , Scale [1:62500] Scale [5:20] Contour Interval 20 Feet - Washington US Geological Survey 1914 - 1 Map Coloured 52 X 42 cm

Datum is mean sea level Approximate Mean Declination 1911

Index Terms--Genre/Form:
Topographic Map

Dewey Class. No.: 912.773