Lampland, Carl O, Credit for the discovery of Pluto
The Martian Polar Cap "Carbonic Acid" hypothesis
Letter from Carl Lampland to Clyde Tombaugh, November 5, 1932, 1932-11-05
Rock salt crystals for prism purposes; Dry ice, Martian polar caps, carbon dioxide (the 'Carbonic Acid' hypothesis) and Dr. Alter's comments on life…