The New York Public Library as seen from the intersection of East 42nd Street and Fifth Avenue. July 14, 1915. Copyright Office Collection. View full size.

Union Army guard at Price, Birch & Co. slave pen at Alexandria, Virginia, circa 1865. Detail of albumen print. View full size. Photograph by Andrew J. Russell.

Exterior view of Price, Birch & Co. slave pen at Alexandria, Virginia, circa 1865. Wet collodion, half of glass plate stereograph pair. View full size.

Interior view showing cells of Price, Birch & Co. slave pen at Alexandria, Virginia, circa 1865. Wet collodion, half of glass plate stereograph pair. View full size.

Price, Birch slave pen cells at Alexandria, Virginia, circa 1865. Wet collodion, half of glass plate stereograph pair. View full size.

Price, Birch slave pen at Alexandria c. 1865. Half of stereo pair. View full size.

Wall Street east from Nassau Street, 1911. View full size. Irving Underhill.

March 1936. "One-room hut housing a family of nine built on the chassis of an abandoned Ford in a field between Camden and Bruceton, Tennessee, near the river." 35mm nitrate negative by Carl Mydans. View full size.

A hobo jungle along the riverfront in St. Louis, Missouri. March 1936. Medium format nitrate negative by Arthur Rothstein. View full size.

Re-tiring a locomotive driver wheel in the Atchison, Topeka, & Santa Fe railway shops at Shopton, near Fort Madison, Iowa. March 1943. View full size. 4x5 Kodachrome transparency by Jack Delano.

Magazine and cannonballs at Battery Rodgers, Alexandria, defending Washington during the Civil War, circa 1863. View full size. Half of stereograph pair.

Boston Nationals shortstop Walter "Rabbit" Maranville, twenty-one years old. April 12, 1913. View full size. George Grantham Bain Collection.

Baby girl of family living on Natchez Trace Project, near Lexington, Tennessee. March 1936. View full size. Photograph by Carl Mydans.

Children playing with Campbell Kid dolls. New York City, March 1912. View full size. Photograph by Lewis Wickes Hine.

"Durward Nickerson, Western Union messenger #55. Birmingham, Alabama. 18 years old. Lives in Bessemer, R.F.D. #1. Saturday night, Sept. 26, 1914, he took investigator through the old Red Light on Avenue A, pointed out the various resorts, told about the inmates he has known there. Only a half dozen of them were open now. Durward has put in two years in messenger work and shows the results of temptations open to him. He has recently returned from a hobo trip through 25 states. He was not inclined to tell much about the shady side of messenger work, but one could easily see that he has been through much that he might have avoided in a profitable kind of work." View full size. Photo by Lewis Wickes Hine.