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21. Entrance to Chicago harbor showing the state of the bar April 4th, 1854 before the dredging of the direct ship channel was commenced.
1856. Graham, J. D. (James Duncan), 1799-1865.,Gamble, William.,United States. Army. Corps of Topographical Engineers. The soundings are in feet & tenths. Those expressed in small figures were made by Mr. Wm. Gamble, U.S. Agent on April 4th 1854. The 12 ft. curve is...
22. Functional pattern of the railways in Metropolitan Chicago /Harold M. Mayer.
1943. Mayer, Harold M (Harold Melvin),1916-1994. Figure 2. Also appeared in author's Ph. D. dissertation (University of Chicago, 1943): The railway pattern of metropolitan Chicago.; Scale [ca. 1:5...
23. Glacial Drift: Thickness and Character: Illinois, 2004
1994. Illinois State Geological Survey. This is an SDE feature dataset showing drift thickness in Illinois. Data are originally from ISGS Circular 490 by Piskin and Bergstrom (1975), Plat...
24. Height Modernization (ILHMP) LiDAR Data: Alexander County, Illinois: 2011
2011. Wilson & Company, Inc. This dataset consists of modified FEMA-grade LiDAR point cloud data for the Illinois River floodplain in the following pools: Marseilles Pool (only...
25. Height Modernization (ILHMP) LiDAR Data: Bond County, Illinois: 2015
2015. This Digital Terrain Model (DTM) data was produced all or in part from LiDAR information as of 2015. The LiDAR derived DTM covers Bond County, Illi...
26. Height Modernization (ILHMP) LiDAR Data: Boone County, Illinois: 2007
2007. This data set was developed for the United States Geological Survey. by Sanborn Mapping. Provide FEMA compliant elevation, topography and contour map of Boone County, Illinois. Provide Bare Earth DEM (vegetation removal) of Boone County...
27. Height Modernization (ILHMP) LiDAR Data: Bureau County, Illinois: 2015
2015. Surdex Corporation. This project involved fixed wing aerial LIDAR data collected at a contracted point spacing of 0.70 meters for the Illinois County of Bureau totalin...
28. Height Modernization (ILHMP) LiDAR Data: Calhoun County, Illinois: 2011
2011. Wilson & Company, Inc. This dataset consists of modified FEMA-grade LiDAR point cloud data for the Illinois River floodplain in the following pools: Marseilles Pool (only...
29. Height Modernization (ILHMP) LiDAR Data: Carroll County, Illinois: 2009
2009. Quantum Spatial, Inc (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 2 and includes Carroll County, Illinois. The data is updated from its orig...
30. Height Modernization (ILHMP) LiDAR Data: Champaign County, Illinois: 2008
2008. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 5 and includes Champaign County, Illinois. The data is updated from its or...