"Indoors and Out", Nature Magazine number 33 (May 1940) p. 255, quoted in Mark Harvey, Wilderness Forever (2005) p. 45
Famous Howard Zahniser Quotes
From an early draft of the Wilderness Act (S. 1176, submitted to the Senate 11 February 1957, as reprinted in The Living Wilderness volume 21, number 59, Winter-Spring 1956-57, p. 26-36)
The Wilderness Act http://www.wilderness.net/nwps/legisact (Public Law 88-577; 16 USC 1131-1136; approved 3 September 1964)