- Allen, Courtney, 1896-
- Digital Commonwealth
- Boston Public Library
- U. S. Government Printing Office
Two men and a woman working on American military airplane engine, with other airplanes in background. In the upper left hand corner is a bomb logo with the words "6th war loan. U.S. Government Printing Office : 1944-0-609249. Official U.S. Treasury Poster WFD-947.
- No known copyright restrictions. No known restrictions on use.