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Map
Morton Arboretum, DuPage County, Illinois (topographic survey)circa 1970
Chicago Aerial Survey Co.
Map
Hidden Lake Forest Preserve, Exhibit 1: Arboretum-Forest Preserve District Cooperative Research Program Space StudyApril 23 1985
Forest Preserve District of DuPage County
Map
Morton Arboretum [Aerial Photograph and] Conservation Plan Map, Kane-DuPage Soil Conservation District.June 1964
U.S. Soil Conservation Service
Map
North-South Tollway preliminary alignment (Ogden Avenue-Butterfield Road. Contractor) Envirodyne Engineers, Inc.February 21 1985
Illinois State Toll Highway Authority
Map
North-South Tollway preliminary plans [by] Envirodyne Engineers. Aerial photography by Aero-metric Engineering, Inc., photogrammetric engineers.March 1 1986
Illinois State Toll Highway Authority
Map
Existing and proposed watersheds, North-South Tollway planMarch 1 1986
Illinois State Toll Highway Authority
Map
Hidden Lake Forest Preserve [Exhibit 1: Arboretum-Forest Preserve District Cooperative Research Program Space Study]April 1984
Forest Preserve District of DuPage County