A view looking down Broadway during the parade procession to celebrate Howard Hughes' completion of his round-the-world flight.

A view looking down Broadway during the parade procession to celebrate Howard Hughes' completion of his round-the-world flight.

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). 

Typed onto a piece of paper attached to the image: new York Hails Hughes and Companions, New York City --- In the greatest reception since Lindbergh's, Howard Hughes and his four gallant companions paraded up Broadway July 15 almost smothered beneath Manhattan's ticker tape accolade recognizing their record-smashing Round-the-World flight. This picture shows Hughes, center, waving to the cheering thousands. On the left is Grover Whalen, commissioner of the New York 1939 World's Fair and on the right is Al Lodwick, Hughes' flight manager. 7-15-38. Credit Line (ACME)."