The Expeditions of Zebulon Montgomery Pike, Volume 3 (of 3) / To Headwaters of the Mississippi River Through Louisiana Territory, and in New Spain, During the Years 1805-6-7.

The final volume collects supplementary material and editorial apparatus for the expedition narrative: a comprehensive index spanning all three volumes, facsimile maps and plates reproducing the early charts, a historico-geographical chart, and an editor's memoir with critical commentary. It presents appendices of variant place-names, cross-references and corrections, illustrative plates such as the Falls of St. Anthony and river charts, and updated map compilations. These materials contextualize the field journals, clarify toponymy and cartography, and supply documentary and navigational tools for readers and researchers.