Orth, Donald (1967). Dictionary of Alaska Place Names. U.S. Government Printing Office. p. 573. Retrieved 24 January 2016. 1917 by R. F. Griggs, National Geographic Society; inspired by Lethe, the river of forgetfulness in the Hades of Greek mythology.
usgs.gov
planetarynames.wr.usgs.gov
"Lethe Vallis". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
