Two men at a campsite, ca.1920 

Workers inside a building supplying refrigeration to freight cars, ca.1920 

Two men outside the Pony blimp hangar, taken in April 1920 

Two men working at a machine inside an unidentified factory, ca.1942 

Two automobiles parked on a hill, with a group of men looking at the view, ca.1920 

Two men shipping melons, [s.d.] 

Crowd near the locomotive "The Royal Scot," circa 1930 

Shell Oil Company employees at work, showing two men standing in front of machinery, ca.1940 

Interior view of an unidentified factory, showing three men at a large engine, ca.1940 

Men surveying on a hillside, ca.1930 

Three men surveying a wire through a stream, ca.1930 

Two connected railway cars, showing passengers through a window at left, ca.1930 

Astronomers in an observatory who appear to be looking through the eyepiece of a telescope, ca.1920-1930 

Interior view of an observatory showing astronomers at work, ca.1920-1930 

Two men in a clothing factory, ca.1935 

Men standing near automobiles parked in the mountains, ca.1920 

Four men examining a Northrop T-38 outside a hangar, ca.1960 

Two men listening to a "talking book", [s.d.] 

Charles Lindbergh posing with three other men near an airplane, ca.1924 

Two men operating a tractor at an industrial site, [s.d.]