Source: Perry-Castañeda Library Map Collection (a collection of maps where most are in public domain, see Library Web Material Usage Statement .

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This file is in the public domain because it's material from the Perry-Castañeda Library Map Collection, collection of maps where most are in public domain) This template must not be used to dedicate an uploader's own work to the public domain; CC0 should be used instead. This work must carry justifications for free usability in both the United States and its country of origin.