National Geographic : 1950 Oct
522 U.S.Navy. Official-Johns Holkins University (APL) Thunderheads Are Mere Cotton Wisps When Seen from 35 Miles Up. Earth's Curvature Is Visible onHorizon 400 Miles Away Large thundercloud at right center has typical anvil shape. Others show at upper left and far right, among scattered cumulus. "Lakes" inforeground arelava beds north of White Sands Proving Ground, New Mexico (page 525). Dark line in right foreground is Southern Pacific railroad track. White linebeside itisHighway 54.