December 1941 or January 1942. "Child of a Farm Security Administration rural rehabilitation borrower in front of his house in Puerto Rico." 35mm Kodachrome transparency by Jack Delano for the FSA. View full size.

May 1943. Melrose Park, Ill. Chicago & North Western towerman R.W. Mayberry of Elmhurst at the Proviso Yard. He operates a set of retarders and switches at the hump. View full size. 4x5 Kodachrome transparency by Jack Delano.

October 1942. Metal parts are placed on masonite by this employee before they slide under the multi-ton hydropress at North American Aviation in Inglewood, California. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

September 1942. Students at Washington High School in Los Angeles training for specific contributions to the war effort. Instructor Ralph Angar explains propeller characteristics to students in the aeronautics class. View full size. 4x5 Kodachrome transparency by Alfred Palmer, Office of War Information.

Spring 1943. The town of Questa in Taos County, New Mexico. View full size. 4x5 Kodachrome transparency by John Collier, Farm Security Administration.

July 1942. "Wiring a junction box on the firewall for the right engine of a B-25 bomber at the North American Aviation plant in Inglewood, California. Forward of this wall will be mounted one of two 1,700-horsepower Wright Whirlwind engines." 4x5 Kodachrome transparency by Alfred Palmer. View full size.

Extracted sulfur stacked in a "vat" 60 feet tall at Freeport Sulphur Co. in Hoskins Mound, Texas. View full size. 4x5 Kodachrome transparency by John Vachon.

May 1943. Sixty-foot-tall sulfur vat at the Freeport Sulphur Co. in Hoskins Mound, Texas. View full size. 4x5 Kodachrome transparency by John Vachon.

April 1943. Schoolchildren in San Augustine County, Texas. 4x5 Kodachrome transparency by John Vachon, Office of War Information. View full size.

May 1943. "Nearly exhausted sulfur vat from which railroad cars are loaded. Freeport Sulphur Company at Hoskins Mound, Texas." View full size. 4x5 Kodachrome transparency by John Vachon, Office of War Information.

May 1942. Another shot of Marines training with barrage balloons at Parris Island, S.C. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

May 1942. Motor detachment at the New River, North Carolina, Marine base. View full size. 4x5 Kodachrome transparency by Alfred Palmer, O.W.I.

May 1942. Marine transport driver at New River, North Carolina. View full size. 4x5 Kodachrome transparency by Alfred Palmer, Office of War Information.

October 1942. B-25 bomber nose wheel and landing gear assembly at the North American Aviation plant in Inglewood, California. View full size. 4x5 Kodachrome transparency by Alfred Palmer for the Office of War Information.

June 1942. An M-4 tank at Fort Knox, Kentucky. View full size. 4x5 Kodachrome transparency by Alfred Palmer for the Office of War Information.