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.

July 1939. Corner of a sharecropper's kitchen showing stove and butter churn. Person County, North Carolina. View full size. Photograph by Dorothea Lange.

February 1939. "On U.S. 99 between Bakersfield and the Ridge, en route to San Diego. Migrant man shaving by roadside." View full size. Medium-format nitrate negative by Dorothea Lange for the Farm Security Administration.

October 1939. "Father and son have cleared thirty acres of raw stump land in three years. Boundary County, Idaho." View full size. Photo by Dorothea Lange.

From 1929, another view of the peripatetic Burn family and their unusual car on G Street in Washington, D.C. View full size. National Photo Co. Collection.

July 1923. A wagon horse outfitted against summer insect pests on the streets of Washington, D.C. View full size. National Photo Company Collection.

A street vendor and his radio-equipped cart circa 1928 in Washington, D.C. View full size. 4x5 glass negative from the National Photo Company Collection.