"1938 expeditions" . . "attempt on Mount Everest" . "1938 British Mount Everest expedition" . "1938 Everest expedition" . "attempt on Everest with Tilman as leader" . . . . "expedition led by Tilman in 1938" . "1938" . . "Mount Everest expedition" . "Everest expedition" . . "1938 British Mount Everest expedition" . . "1938 British" .