Uneven growth in the US Postal Service by 1890. (IMAGE)

Proceedings of the National Academy of Sciences

Uneven growth in the US Postal Service by 1890.

Caption

Uneven growth in the US Postal Service by 1890. The image shows a cartogram of the more than 3,000 counties of the contiguous 48 United States, each of which is colored and sized based on the number of post offices present as of 1890. 

Credit

Image credit: Adam Ramey.

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