Aton, J. M. (2010). John Wesley Powell: His life and legacy. Bonneville Books.
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Dyfyniad Arddull Chicago
Aton, James M. John Wesley Powell: His Life and Legacy. Salt Lake City: Bonneville Books, 2010.
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Dyfyniad MLA
Aton, James M. John Wesley Powell: His Life and Legacy. Bonneville Books, 2010.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.