Postcard - Phoenix, Arizona

"Arizona Veterans Memorial Coliseum, Phoenix, Arizona. The most modern, fully-equipped and luxurious coliseum and convention center in the entire Southwest is focal point of the 80-acre Arizona State Fairgrounds. Beautifully equipped and decorated, it seats over 14,000 and hosts conventions, sporting events, exhibits, trade shows, theatrical productions and concerts."

Late 1960s?

Postcard - Phoenix, Arizona

"North Central Highrise Complex, Phoenix, Arizona. Viewing from the left: Executive Towers Apartments, Del Webb's Towne House, Del Webb Office Building, Guarantee Bank, and the Financial Center. The two circular satellites adjacent to the Financial Center are the Pioneer and Home Savings Banks. Picturesque Squaw Peak looms on the horizon."

I'm guessing 2nd half of the 1960s. Squaw Peak was renamed Piestewa Peak in 2003.

Postcard - Phoenix, Arizona

"Aerial View of Downtown Phoenix, Arizona. The Capitol of Arizona, Phoenix with a population of approx. 350,000 is a desert metropolis in the center of the fertile Salt River Valley. World famous as a winter resort. Phoenix also is prominent in the supply of citrus and produce."

If the population estimate is correct, this postcard dates back to the 1950s.