"United States, Pennsylvania" . . "Ohio River Discovery and exploration." . . . . "Québec (Province)" . . "Nouvelle-France" . . "Allegheny River Valley (Pa. and N.Y.)" . . "1763 - 1791" . . "French Pennsylvania." . . "Allegheny River (Pennsylvania and New York)" . . . . . . . . . . . "History"@en . "History" . . . . . . . . . . . . . "\"The Allegheny and Ohio rivers were generally regarded by the early explorers as one stream\"--p. 9."@en . . . . . . . . . "The French in the Allegheny Valley"@en . "The French in the Allegheny Valley" . . . "The French in the Allegheny valley" . . "The Allegheny River rises in New York near the Pennsylvania border and enters in the Ohio River at Pittsburgh."@en . . . . . . . . . . . . . . "Alleghanys" . . "University of Pittsburgh. University Library System. Digital Research Library." . . "United States" . . "1755 - 1791" . . "Canada" . . "1754 - 1763" . .