Public domain
Cowling and control rods are added to motors for North American B-25 bombers as they move down the assembly line, N[orth] A[merican] Aviation, Inc., Inglewood, Calif.
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineCowling and control rods are added to motors for North American B-25 bombers as they move down the assembly line, N[orth] A[merican] Aviation, Inc., Inglewood, Calif.. 1939-01-01. Palmer, Alfred T.. FSA/OWI Color Photographs, Library of Congress. Public domain.