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Second derivative, Jefferys' ed. of Evans' 1755 map; Jefferys transforms it into a timely depiction of the theatre of the French and Indian War, including "Ft du Quesne destroy'd 1758" (Pittsburg), English attack on Fort Carillon (Ticonderoga) & etc Relief shown pictorially Shows "West longitude from London" and "from Philadelphia." Scale ca. 1:2,250,000 Inset map: A sketch of the remaining part of Ohio R. &c

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