Public domain
Carl Sandburg, author of the commentary to the Office of Emergency Management (OEM) motion picture, "Bomber" discuuses some of the finer points of the construction of the Glenn L. Martin bomber with chief production test pilot, Roland Lee Sansbury
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineCarl Sandburg, author of the commentary to the Office of Emergency Management (OEM) motion picture, "Bomber" discuuses some of the finer points of the construction of the Glenn L. Martin bomber with c. 1940-01-01. United States. Office For Emergency Management. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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