GCL3385241: HELEN ADAMS KELLER (1880-1968). American writer and lecturer. Photograph, c.1912. / Bridgeman Images

GCL3385242: HELEN ADAMS KELLER (1880-1968). American writer and lecturer. Photographed touching a statue, c.1912. / Bridgeman Images

GCL3385244: JOHN LLEWELLYN LEWIS (1880-1969). American labor leader. Lewis addressing the United Mine Workers. Photographed 28 January 1936. / Bridgeman Images

GCL3385254: CHRISTIAN DIOR (1905-1957) French fashion designer. Photographed on board the Queen Mary ocean liner, arriving in New York City, October 1956. / Bridgeman Images

GCL3385259: PACIFIC THEATER, 1944 American military leaders at a strategy meeting with President Franklin D. Roosevelt at Waikiki, Hawaii, during World War II. From left: Gen. Douglas MacArthur, Roosevelt, Admiral William Daniel Leahy, and Admiral Chester Nimitz. Photographed 28 July 1944. / Bridgeman Images

GCL3385260: JEFFERSON DAVIS (1808-1889) President of the Confederate States of America. Undated photograph from the Mathew Brady Studio. / Bridgeman Images

GCL3385266: CORDELL HULL (1871-1955) American politician. Secretary of State Hull called back to Washington, D.C., following the Japanese attack on Pearl Harbor, December 1941. / Bridgeman Images

GCL3385287: President-elect Roosevelt shaking hands with outgoing President Hoover, 1933 (photo) / Bridgeman Images

GCL3385293: MIGRANT FARMERS, 1940 Migrant father and daughter picking cherries at a farm in Berrien County, Michigan. Photograph by John Vachon, July 1940., Vachon, John (1914-75) / Bridgeman Images

GCL3385015: GEORGE EMLEN ROOSEVELT (1887-1963) American financier. Roosevelt (far left) at a party at the Castle Harbor Hotel, Bermuda, with the wife of Philip S. Gardiner and Lord Carew, aide-de-camp to the governor of Bermuda. Photographed 1935. / Bridgeman Images

GCL3385017: GEORGE EMLEN ROOSEVELT (1887-1963) American financier. Photographed 1957. / Bridgeman Images

GCL3385018: ROOSEVELT FAMILY, 1934 Two young men of the Roosevelt family vacationing in Bermuda. From left: George E. Roosevelt, Jr.; Van S. Merle-Smith, Jr.; and W. Emlen Roosevelt. Photographed 1934. / Bridgeman Images

GCL3385022: GEORGES ROUAULT (1871-1958). French artist, 1935 (b/w photo) / Bridgeman Images

GCL3385024: BOB RAFELSON (1933-) American film director. Rafelson on the set of 'Five Easy Pieces,' 1970. / Bridgeman Images

GCL3385026: DAVID ROCKEFELLER (1915-) American banker. Rockefeller, Chairman of Chase Manhattan Bank (right), in Paris with Paul Delouvrier, Chairman of the French Electricity Board. Photographed 1975. / Bridgeman Images

GCL3385037: GLACIER NATIONAL PARK Entrance to Glacier National Park in Montana. Photograph, 1914. / Bridgeman Images

GCL3385041: GLACIER NATIONAL PARK Stark Peak and waterfall at Glacier National Park in Montana. Photograph, c.1919. / Bridgeman Images

GCL3385043: HYMAN GEORGE RICKOVER (1900-1986) Four-star admiral in the United States Navy. Photographed 1973. / Bridgeman Images

GCL3385049: WALTER W. ROSTOW (1916-2003) American economist. Photographed 1962. / Bridgeman Images

GCL3385054: SARA DELANO ROOSEVELT (1854-1941) Mother of President Franklin Delano Roosevelt. Photographed c.1930. / Bridgeman Images

GCL3385057: SARA DELANO ROOSEVELT (1854-1941) Mother of President Franklin Delano Roosevelt. Photographed c.1940. / Bridgeman Images

GCL3385063: VIRGINIA: SLAVE DEALER Union Army guards in front of a slave-dealing establishment of Price, Birch, and Co. in Alexandria, Virginia. Photograph, c.1861. / Bridgeman Images

GCL3385065: BILL COSBY (1937-) American actor, comedian and writer. / Bridgeman Images

GCL3385068: WALLACE HUME CAROTHERS (1896-1937). American chemist. Photographed c.1930. / Bridgeman Images

GCL3385074: NAST: EMANCIPATION Cartoon showing a slave being purchased prior to 1863 (left) and a slave being whipped for a crime after emancipation. Wood engraving, 1863, after Thomas Nast. / Bridgeman Images

GCL3385076: CHESTER CARLSON (1906-1968) American physicist and inventor of the xerography process and the copying machine. Photograph, mid 20th century., Unknown photographer, (20th century) / Bridgeman Images

GCL3385080: FORMER SLAVE, 1937 Elija Cox, a former slave, playing the guitar. Photographed 1937. / Bridgeman Images

GCL3385087: COAL MINER, c.1915 A coal miner standing on the back of coal mining car moving through a tunnel. Photograph, c.1915. / Bridgeman Images

GCL3386001: LEON TROTSKY (1879-1940) Né Lev Davidovich Bronstein. Russian Communist leader. Photograph, early 20th century. / Bridgeman Images

GCL3386005: WALT WHITMAN (1819-1892) American poet. Photograph, 15 August 1887. / Bridgeman Images

GCL3386026: UNCLE TOM'S CABIN, c.1898 Lithograph poster, c.1898, for Al W. Martin's Mammoth production of 'Uncle Tom's Cabin,' by Harriet Beecher Stowe. / Bridgeman Images

GCL3386031: UNCLE TOM'S CABIN, c.1899 Lithograph poster, c.1899 / Bridgeman Images

GCL3386038: WOOLWORTH BUILDING, 1912 Tower construction for the Woolworth Building on lower Broadway, New York City, which was completed in April 1913. On the right is the Municipal Building, also under construction. Photograph, c.1912. / Bridgeman Images

GCL3386041: WOOLWORTH BUILDING, 1912 Partially constructed lower section of the Woolworth Building amidst smaller buildings, New York City. Photograph, c.1912. / Bridgeman Images

GCL3386046: WOOLWORTH BUILDING, 1913 The Woolworth Building, New York City, the world's tallest building at the time of its completion in 1913 until 1930. Photograph, 1913. / Bridgeman Images

GCL3386047: WOOLWORTH BUILDING, 1913 The Woolworth Building, New York City, the world's tallest building at the time of its completion in 1913 until 1930. Photograph, 1913. / Bridgeman Images