A tap dancing class in the gymnasium at Iowa State College in Ames, Iowa. Photo by Jack Delano, 1942. View full size.

A woman sitting on a wall looks at the mountains behind her. The image is by fashion photographer Toni Frissell and was published in Harper's Bazaar in February 1947. View full size.

"Young fellows in front of pool hall," in Jackson, Ohio. Photo by Theodor Jung, 1936. View full size.

A photo of William Grass on the starting line. National Photo Company, 1922. View full size.

This picture shows the "Four Novelty Grahams" acrobatic performers at the Victoria Theatre, Philadelphia. The father is 23 years of age. Willie Graham is 5 years of age, and Herbert Graham is 3 years of age. At 9 P.M. on June 10th, 1910, these children were performing on the stage. Four times daily they do a turn which lasts from 12 to 14 minutes. Herbert Graham, the youngest, was said by the father to have commenced performing on the stage as an acrobat when he was 10 months of age. Willie, now 5, is said to be the youngest acrobat in the world. The mother of these boys was formerly a school teacher, and is now performing with this trio on the stage. The children are bright and strong, but have a playfulness about them which shows them to have forgotten the best years of childhood. Photo by Lewis W. Hine, 1910. View full size.

June 1938. Nettie Featherston, laborer's wife with three children near Childress, Texas. "I just prayed and prayed and prayed all the time that God would take care of us and not let my children starve." View full size | Audio interview.

June 1938. Nettie Featherston, wife of a migratory laborer with three children. Near Childress, Texas. "If you die, you're dead – that's all." View full size. Photo: Dorothea Lange. Bio of Nettie (1898-1984) and audio interview.

U.S. 99 in Kern County on the Tehachapi Ridge. February 1939. Migrant workers travel seasonally back and forth between the Imperial Valley and San Joaquin Valley over this ridge. View full size. Photograph by Dorothea Lange. (The billboard up ahead: "76 miles to GRAPEVINE air cooled cafe.")

Dorothea Lange, Resettlement Administration photographer, in California atop car with her giant camera. February 1936. View full size.

Fourth of July 1939 near Chapel Hill, North Carolina. "Rural filling stations become community centers and general loafing grounds. Cedargrove Team members about to play in a baseball game." Medium-format nitrate negative by Dorothea Lange. View full size.

June 1938. Caddo, Oklahoma. Migrants leave the small towns as well as the farms of the southwest. This region is a source of many emigrants to the Pacific Coast. View full size. Photograph by Dorothea Lange.

July 1939. Tenant farmer in Chatham County, North Carolina. View full size. Farm Security Administration photograph by Dorothea Lange.

April 1939. Farm Security Administration migrant camp at Westley, California. Migrant mother with sick baby and agricultural workers medical association card. View full size. Photograph by Dorothea Lange.

Leland, Mississippi. June 1937. View full size. Photograph by Dorothea Lange.

October 1939. Farm Security Administration camp unit at Merrill, Oregon. The camp nurse introduces doctor to mother of sick baby. View full size.