August 1908. Greek bootblack in Indianapolis. An interesting example of a time exposure where the subject either enters the frame after the shutter opens or leaves it before it closes. View full size. Photograph by Lewis Wickes Hine.

October 1942. "Clerk in North American Aviation stockroom, checking to see if the proper numbers of parts were received and placed in the proper bin. Inglewood, California. This plant produces the battle-tested B-25 (Billy Mitchell) bomber, used in General Doolittle's raid on Tokyo, and the P-51 (Mustang) fighter plane which was first brought into prominence by the British raid on Dieppe." View full size. 4x5 Kodachrome transparency by Alfred Palmer.

October 1942. Assembling switchboxes on the firewalls of B-25 bombers at North American Aviation's Inglewood, California, factory. View full size. 4x5 Kodachrome transparency by Alfred Palmer, Office of War Information.

1942. Grand Grocery in Lincoln, Nebraska. View full size. 35mm Kodachrome transparency by John Vachon. Alternate version shows a different view.

October 1942. Lathe operator machining parts for transport planes at the Consolidated Aircraft plant in Fort Worth, Texas. View full size. 4x5 Kodachrome transparency by Howard Hollem, Office of War Information.