Cotlow, Lewis, 1898-; Tombaugh, Clyde William, 1906-1997; Brush, Charles F.; Steel, Richard; Korff, Serge A. (Serge Alexander), 1906-1989; Roy, Marie E.
Explorers Club; Tombaugh, Clyde William, 1906-1997; Membership; Thank-you notes; Fund raising; Dinners and dining; Tombaugh, Clyde William, 1906-1997. Out of the darkness: The planet Pluto; Books--Reviews; Discoveries in science; Dues