NMLP P-035590 · Point of issue · minted 2026-07-09
Exploration of the Colorado River of the West and Its Tributaries
John Wesley Powell · Government Printing Office (Washington), published under direction of the Secretary of the Smithsonian Institution · 1875
As a government publication issued under the Smithsonian's imprint rather than a trade publisher, first-edition copies are found in more than one original binding style -- plain dark cloth in some copies, gilt-lettered cloth or half calf in others -- so binding alone is not a reliable guide; collating the text against the full run of 80 numbered illustrations and confirming both rear sheets are present is the primary check for completeness
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New Mexico Literacy Project — Point of issue NMLP P-035590 for "Exploration of the Colorado River of the West and Its Tributaries" by John Wesley Powell (https://newmexicoliteracyproject.org/id/point/p-035590, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).