Sanborn maps
![Sanborn map of Boston from 1867](https://upload.wikimedia.org/wikipedia/commons/a/a4/Sanborn_Boston_1867_sheet_1a.gif)
Sanborn held a monopoly over fire insurance maps for the majority of the 20th century, but the business declined as US insurance companies stopped using maps for underwriting in the 1960s. The last Sanborn fire maps were published on microfilm in 1977, but old Sanborn maps remain useful for historical research into urban geography. The license for the maps was acquired by land data company Environmental Data Resources (EDR), and EDR was acquired in 2019 by real estate services company LightBox. Provided by Wikipedia
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