The Office of War Information, created in the US during WWII, was an agency designed to aid in the war effort on the homefront.
Among other things, they employed civilians, especially women, to build items needed; these photos show B-52 bombers being constructed.
These particular images were taken by Alfred Palmer between 1940-43 from several plants in California and Texas.
For more WWII resources check out:
US History PowerPoints
US History Classroom games
World History PowerPoints