Candid photograph of McElroy at approximately 50 years old.

Candid photograph of Ingle at approximately 55 years old, sitting in front of a bookshelf.

Candid photograph of Ingle at approximately 55 years old, sitting in front of a bookshelf.

Candid photograph of Dr. Hardie at work in his laboratory.

Candid photograph of Cloos performing a simulation of a volcanic eruption.

Candid photograph of Cloos performing a simulation of a volcanic eruption.

A caption on the back of the photograph gives more information.

Interior view of Applied Physics Laboratory, showing the presentation of the flag of Maryland, with Ralph Edward Gibson, Lincoln Gordon, Frank Trelford McClure, and Stuart Symington Janney, Jr.