"The Letter." New York, 1906. Studio portrait of the Gerson sisters in costume for the Crinoline Ball. 8x10 glass negative by Gertrude Käsebier. View full size.

"Lollipops." Mina Turner and her cousin Elizabeth in Waban, Massachusetts. 1910. View full size. 8x10 dry plate glass negative by Gertrude Kasebier.

1921, Washington D.C. "Francis Rawling, P.O. Club." View full size. National Photo Company Collection glass negative. Any P.O. Club members out there?

November 24, 1923. Miss Anita Phipps, director of women's relations for the War Department. View full size. National Photo Company Collection.

October 1939. "Soper grandmother, who lives with family. Farm Security Administration borrower. Willow Creek area. Malheur County, Oregon." Medium-format nitrate negative by Dorothea Lange for the FSA. View full size.

August 27, 1925. Montgomery County, Maryland. "Mrs. Margaret Barnes at the Rockville Fair." View full size. 4x5 glass negative, National Photo Company.

1926 or 1927. "Mr. Tabber Raleigh Habudashu," says the Library of Congress. What we see written on the negative is "Tabber of Raleigh, Haberdasher." 4x5 glass negative, National Photo Company Collection. View full size.

October 1939. "Ex-Nebraska farmer now developing farm out of the stumps. Bonner County, Idaho." View full size. Medium-format nitrate negative by Dorothea Lange for the Farm Security Administration.

December 1936. This formidable-looking lady either had something to do with the Resettlement Administration's creation of Greenhills, Ohio, one of the first planned communities in the United States, or she was tragically misfiled at the Library of Congress. Either way, her caption has no name. View full size. Medium format negative by Brice Martin. [Update: The mystery lady is Dorothy M. Beck, a regional director of the Resettlement Administration.]

February 5, 1921. "Miss Bertha May Graf, chosen the prettiest girl at suffrage headquarters in Washington, will be chief flower girl at the National Woman's Party convention." View full size. National Photo Company Collection.

April 1941. South Side Chicago boy. View full size. 35mm nitrate negative by Edwin Rosskam for the Farm Security Administration.

October 1939. "Young migrant mother has just finished washing. Merrill Farm Security Administration camp, Klamath County, Oregon." View full size. Medium format nitrate negative by Dorothea Lange for the FSA.

February 5, 1921. "Miss Bertha May Graf, chosen the prettiest girl at suffrage headquarters in Washington, will be chief flower girl at the National Woman's Party convention." Miss Graf resides at 1429 Longfellow Street NW in the District of Columbia. View full size. 4x5 glass negative, National Photo Company.

December 1942. Melrose Park, Illinois. Roy Nelin, a box packer in the Proviso Yard roundhouse of the Chicago & North Western R.R. View full size. 4x5 Kodachrome transparency by Jack Delano for the Office of War Information.

The photographer Walker Evans in a February 1937 portrait by his colleague Edwin Locke. 35mm negative, Farm Security Administration. View full size.