The Journal of Andrew Ellicott, Late Commissioner on Behalf of the United States During Part of the Year 1796, the Years 1797, 1798, 1799, and Part of the Year 1800 for Determining the Boundary Between the United States and the Possessions of His Catholic Majesty in America ; Containing Occasional Remarks on the Situation, Soil, Rivers, Nat. Productions, and Diseases of the Different Countries on the Ohio, Mississippi, and Gulf of Mexico ; with Six Maps