From Harvey's Hotel and Casino Postcard Collection (PH-00367) -- Postcard reads, "'Atomic detonation shown was 75 miles distant.' From the 'Up and Atom' City Las Vegas, Nevada"
From the Las Vegas: Snapshots of History Photograph Collection (PH-00425). Stardust Resort and Casino, Circus Circus Las Vegas, Sahara Hotel and Casino, Silverbird Casino and Riviera Casino (identified from left to right).