RoadsideAmerica.com
Has photos and says that the arrow sign was created by the Boy Scouts in the 1950's.
Arizona Oddities-Giant Arrow Points to Phoenix March 4, 2012
KJZZ-Did You Know: Phoenix Air Marker Has Been Around Since The 1950s
Nice article about how the Boy Scouts spent 5 1/2 years building the arrow sign. Has a close-up of the 100 foot P. A massive amount of rock was used to create the air marker.
JoeOrman.Shutterace.com-PHOENIX SIGN
Phoenix on Usery Mountain - Mesa Arizona - Letters on Hills on Waymarking.com
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