Public domain
Washington, D.C. The U.S. Weather Bureau station at the National Airport. Pilot balloon being released to determine wind direction and velocity aloft
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineWashington, D.C. The U.S. Weather Bureau station at the National Airport. Pilot balloon being released to determine wind direction and velocity aloft. 1943-01-01. Driscoll, Fred. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.