Illinois, La Harpe quadrangle - topography - 1e82eb0b75fd15529a0c8ea0fd0ba437
Summary
1 map, colored; Relief shown by contours and spot heights.; Surveyed in cooperation with the State of Illinois.; Surveyed in 1916.; Contour interval 20 feet.; Scale 1:62,500
Date
1918
Source
University of Illinois Urbana-Champaign University Library
Copyright info
Public Domain