From the Sister Klaryta Antoszewska Photograph Collection (PH-00352). The slide reads: "Comparison of the cumulative estimated dose with diagnostic x-rays 1951 to 1958.

From the Sister Klaryta Antoszewska Photograph Collection (PH-00352). 

From the Sister Klaryta Antoszewska Photograph Collection (PH-00352). 

From the Sister Klaryta Antoszewska Photograph Collection (PH-00352). 

First floor of Boulder City Museum room, looking north. Door at the right leads to the administrative Offices. Door at the right leads outside.

Description given with photograph: "Hughes sets new transcontinental transport mark. Floyd Bennet Field, NY--- Howard Hughes, millionaire flier, setting his famous round-the-world transport plane down here, early August 20th, after a record-smashing flight from Los Angeles. Hughes and three companions completed the trip in 10 hours 32 minutes and 20 seconds, shattering the record of 11 hours and five minutes set four years ago by Tommy Tomlinson. The flight was made most of the way in the substratosphere at an average altitude of 17, 000 feet. Credit Line ACME."