Sanborn
Fire Insurance Map Key D = Dwelling S = Store A number within the structure shows the number of stories. Yellow = wood structure Pink - brick Blue - concrete & stone
Source:
(1883) Sanborn Fire Insurance Map from Iowa City, Johnson County, Iowa.
Sanborn Map Company, Sep. [Map] Retrieved from the Library of Congress,
https://www.loc.gov/item/sanborn02695_001/.
