Tombaugh, Clyde W., Credit for the discovery of Pluto
The Martian Polar Cap "Carbonic Acid" hypothesis
Letter from Clyde Tombaugh to Carl Lampland, November 1, 1932, 1932-11-01
Professor Baker's book and credit for the discovery of Pluto. Rock salt crystals for prism purposes. Dry ice, Martian polar caps, carbon dioxide…