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Salem (Ill.); Marion C... (1)
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1. Illinois (Marion County) Salem quadrangle Illinois (Marion County) Salem quadrangle Salem (Ill.); Marion County (Ill.); Maps; Topographic maps; Topography; Illinois Relief shown by contours and spot heights.; "Surveyed in 1921, 1926, 1928, and 1934"; "Contour interval 10 feet."

2. Shawneetown quadrangle, Illinois-Kentucky : 15 minute series (topographic) Shawneetown quadrangle, Illinois-Kentucky : 15 minute series (topographic) Shawneetown; Kentucky; Maps; Topographic maps; Topography; Illinois Relief shown by contours and spot heights.; "Topography from aerial photographs by photogrammetric methods and by planetable surveys. Aerial photographs taken 1957"; "Contour interval 20 feet."; Coordinates:...
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