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, Natural Productions, and Diseases of the Different Countries on the Ohio, Mississippi, and Gulf of Mexico ... ; to which is Added an Appendix