Anybody who studies American cities knows the value of the Sanborn Fire Insurance Maps. These were created by the Sanborn Map Company to help insurance adjusters evaluate risk. Copies of all maps were deposited with the Library of Congress, and were later microfilmed for distribution to local libraries. An agreement with ProQuest put scanned versions of the microfilmed maps (660,000 of them) online for subscription access.
The Chicago Public Library makes these maps available, so at least access is broadening. Many of the denser areas in Rogers Park were included in several editions. When these are compiled it provide a portrait of development through time. These maps are crammed with information, and the problem is often choosing which type of information is most useful to highlight.

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Bird's Eye Aerial from Bing. Probably 2008. |
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