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1. Illinois-Missouri, Campbell Hill quadrangle : topography

1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1915-1916.";"Surveyed in cooperation with the States of Illinois and Missouri."; (W 89⁰45ʹ00ʺ--W 89⁰30ʹ00ʺ/N...