Grand Canyon national park Record of 1,168,807 visitors set in 1959. Post Jan. 20, 1960 p.13 why it is an hourglass for-geologists. National Parks Magazine v.36^1^5 April 1962 p.9-11 The fight to save open space. Post Empire F 20, 1966 p.8-12 New foot bridge built at bottom of Bright Angel Trail, linking North and South rims of the Grand Canyon of the Colorado. American Forests and Forest Life v 35 #8 Ag 1929 p.483-485
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