Reproduction. Printed map dividing Phelps and Gorham's purchase into townships; shows sites of mills, towns, villages and roads; hand colored; printed on left side: "A map of Mefsrs Gorham & Phelp's purchase now the county of Ontario in the state of New York from an actual survey". Under this it is signed: "By A. Porter (in script) and 1794". In small print "Engraved by A. Doolittle N Haven".