Public domain
Demonstration of a device invented by Dr. Lytle S. Adams that would allow an airplane to pickup airmail, Hoover Field, Arlington, Virginia; Washington Monument in distance
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineDemonstration of a device invented by Dr. Lytle S. Adams that would allow an airplane to pickup airmail, Hoover Field, Arlington, Virginia; Washington Monument in distance. 1930-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.