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1. Iowa-Illinois, Clinton sheet : reconnaissance map Iowa-Illinois, Clinton sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; Clinton (Ill.); Iowa Relief shown by contours.; "Surveyed in 1890."; "Contour interval 20 feet."

2. Iowa-Illinois, Goose Lake sheet : reconnaissance map Iowa-Illinois, Goose Lake sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; Goose Lake; Iowa Relief shown by contours.; "Surveyed in 1890."; "Contour interval 20 feet."

3. Iowa-Illinois, LeClaire sheet : reconnaissance map Iowa-Illinois, LeClaire sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; Le Claire (Ia); Iowa Relief shown by contours.; "Surveyed in 1890."; "Contour interval 20 feet"

4. Iowa-Illinois, Savanna sheet : reconnaissance map Iowa-Illinois, Savanna sheet : reconnaissance map Savanna (Ill.); Iowa; Maps; Topographic maps; Topography; Illinois Relief shown by contours.; "Surveyed in 1890."; "Contour interval 20 feet."

5. Iowa-Illinois, Davenport sheet : reconnaissance map Iowa-Illinois, Davenport sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; Iowa; Davenport Relief shown by contours and spot heights.; "Surveyed in 1889."; "Contour interval 20 feet."

6. Illinois, LaSalle sheet : reconnaissance map Illinois, LaSalle sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; La Salle (Ill.) Relief indicated by contours.; "Surveyed in 1891."; "Contour interval 10 feet"
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