Map of an exploring expedition to the Rocky Mountains in the year 1842 and to Oregon & North California in the years 1843-44.
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Map of an exploring expedition to the Rocky Mountains in the year 1842 and to Oregon & North California in the years 1843-44., map, 1849; Philadelphia. (texashistory.unt.edu/ark:/67531/metapth252081/: accessed August 16, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting University of Texas at Arlington Library.