This manuscript map of the Southwest branch of the St. John River was created in fulfillment of the Webster-Ashburton Treaty under the direction of Major J.D. Graham, Principal Astronomer and Head of the Scientific Corps, for the survey of the St. John River boundary.

This map is part of a larger archive, the Thomas Barclay Collection (Coll. 26).

To search the entire Barclay collection visit Maine Historical Society's Beyond Borders search page. or
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