Allen, Henry T. (Henry Tureman), 1859-1930. Alaska, north of the 60th parallel showing the explorations of the party commanded by Lieut. H.T. Allen, 2d U.S. Cavalry., map, 1885; (https://texashistory.unt.edu/ark:/67531/metapth193465/m1/1/: accessed June 21, 2021), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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