Tuesday, May 18th
On this date in 1865, the Prescott Post Office was established.
On this date in 1929, Federal Engineer H.J. Gault arrived in Yuma to begin the final survey of the All-American Canal.
On this date in 1910, John Gardner, Pima County census enumerator, reported that as he entered a Yaqui village in northern Pima County all the Indians quickly vanished. His total count for the village was one female.