The Morton Arboretum [topographic survey, 27 sheets]
Publication InformationChicago, Illinois
Digitization StatusNot yet digitized
Dimensions68 cm W x 85 cm H (Item)
Scale1 inch = 40 feet
Extent27 sheets in binder
Date createdJanuary 1922
DescriptionLarge scale topographic survey based on data developed in 1921-1922. Sheet 1 entitled "Key Map", serves as index to grid squares numbered 1-25 and 27; no square 26 was assigned. Each square represents a surface area approximately 1000 by 1200 feet. True elevations are given. Native woodland forest cover is shown throughout the grid squares.