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1. Illinois (Iroquois county), Gilman quadrangle : 15-minute series Illinois (Iroquois county), Gilman quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Gilman (Ill.); Iroquois County (Ill.) Relief shown by contours and spot heights.; "Mapped by the Geological Survey 1943-1944."; "Contour interval 10 feet."

2. The topographic maps of the United States [standard symbols]. The topographic maps of the United States [standard symbols]. Topographic maps; Topography; Symbols; Key; Topographical drawing; Conventional signs Map on verso.; Chart of standard map symbols used on U.S. topographic maps.

3. Illinois (Macoupin County) Gillespie quadrangle : topography Illinois (Macoupin County) Gillespie quadrangle : topography Illinois; Maps; Topographic maps; Topography; Gillespie (Ill.); Macoupin County (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1912."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

4. Illinois, Delavan quadrangle : 15-minute series Illinois, Delavan quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Delavan (Ill.) Relief shown by contours and spot heights.; "Contour interval 10 feet"; "Surveyed in 1930 and 1935-1936."
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