The Navigator: Containing Directions For Navigating The Monongahela, Allegheny, Ohio and Mississippi Rivers With An Ample Account Of These Much Admired Waters, From The Head Of The Former To the Mouth Of The Latter... With Accurate Maps Of The Ohio And Mississippi. To Which Is Added An Appendix, Containing An Account Of Louisiana, And Of The Missouri And Columbia Rivers, As Discovered By The Voyage Under Captains Lewis And Clarke. Sixth Edition - Improved And Enlarged. (Copy-right secured according to law.) Pittsburgh, Published by Zadok Cramer and sold at his Bookstore, Market-Street. [Price one Dollar.] From the Press of Cramer & Spear ... 1808