Public domain
CURTISS AIRPLANE. CURTISS TWIN ENGINE BIPLANE EXHIBITED AT SENATE OFFICE BUILDING
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineCURTISS AIRPLANE. CURTISS TWIN ENGINE BIPLANE EXHIBITED AT SENATE OFFICE BUILDING. 1917. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.