1919
First airplane landed in Yosemite Valley, May 27. Lt. J. S. Krull, pilot, alone. USNPS, 1919, pp. 183, 190.
LeConte Memorial Lectures instituted. USNPS, 1919, p. 194.
First airplane landed in Yosemite Valley, May 27. Lt. J. S. Krull, pilot, alone. USNPS, 1919, pp. 183, 190.
LeConte Memorial Lectures instituted. USNPS, 1919, p. 194.