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[Aerial photo of sections of The Morton Arboretum] (3.6274)
Date: 1975Creator: Chicago Aerial Survey Co.
Type: Map
Description:Survey includes northwest portion of Arboretum (1" = 400') and "Johnson Farm" and Hidden Lake area. One photo by Chicago Aerial Survey, second photo unknown. "Johnson Farm" includes partial topographic overlay and boundaries of "existing holdings and proposed acquisitions."
Extent: 2 sheets
Johnson Farm (3.7139)
Date: February 28 1978Type: Map
Description:Shows Arboretum "existing holdings" and "proposed acquisitions" "as of February 28, 1978" in northeast part of Arboretum plus area now Hidden Lake Forest Preserve. Includes topographic lines.
Extent: 1 sheet