Map
State of Illinois plat indexcirca 1971
Illinois Department of Public Works and Buildings, Division of Waterways
Map
Rock Valley Metropolitan Council river corridor guide, Rock County Wisconsin, Winnebago and Boone counties, Illinois1981
Northern Illinois University Laboratory for Cartography and Spatial Analysis
Map
Hinsdale Quadrangle1927
Geological Survey (U.S.), Illinois Department of Registration and Education
Map
Forest Cover in Illinois 1820-1980 with maps on forest composition, volume, diversity and coverJune 1990
Illinois Natural History Survey