A close-up view of Amelia Earhart's signature, which is listed in the Davis-Monthan Airfield register. Earhart landed at the site, which is now Davis-Monthan Air Force Base, several times in the 1930s. Numerous pilots from years ago entered their names in this log, which is still at the base.

Photo by Benjie Sanders Arizona Daily Star

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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