1910: John Gardner, Pima County census enumerator, reports that as he entered a Yaquai village in northern Pima County all the Indians quickly vanished. His total count for the village was one female.
1929: Federal Engineer H.J. Gault arrives in Yuma to begin the final survey of the All-American Canal.
2004: Randy Johnson of the Arizona Diamondbacks pitches a perfect game, beating the Braves 2-0, in Atlanta. It was the 17th perfect game in Major League Baseball history, and Johnson — at age 40 — was the oldest pitcher to pitch a perfect game.