Photograph of military aircraft on display, including a Loening OL seaplane (fuselage number 25-228), circa 1910s-1930s. Inscription: "S.F. Airport [written backwards on negative]."Inscription on envelope: "S.F. Airport."
Photograph of five U.S. Army Air Corps Douglas O-38 aircraft in flight over mountainous terrain, February 6, 1931. Caption: "(O39-92P-115) (2-6-31) (12-4100)."
Photograph of four Curtiss JN-4 Jenny aircraft at Grant Park, Chicago, Illinois, circa 1910s-1920s.Inscription: "Planes on line / Victory Liberty Loan / Chicago."