tag:digital.library.illinois.edu,2005:/itemsItems2022-08-02T16:11:44Ztag:digital.library.illinois.edu,2005:Item/6752692021-06-29T02:25:46Z2022-08-02T16:11:44ZRobert Allerton Park, Piatt Co., IllinoisRelief shown by contours and spot heights.University of Illinois at Urbana-Champaign Library