1931: Border patrolmen discover the skeleton of a 25,000-year-old mammoth near Hereford.
1937: Amelia Earhart lands in Tucson, the first stop on her fateful journey across the globe. Her plane is lost en route to Howland Island in July 1937, then she is declared legally dead on Jan. 5, 1939, after an extensive search of the area between Lae, New Guinea, and Howland Island in the South Pacific.
1954: Dean Byron Cummings, professor of archaeology at the University of Arizona and the first white man to see Rainbow Ridge, dies.
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