Relief shown by contours and spot heights. "Compiled in 1976 ... planimetry revised in 1996 from information furnished by the National Park Service; map edited 1996." Includes "Index to 7.5 and 15-minute maps." "46086-C5-PF-062."
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.