GCL3401943: MISSISSIPPI RIVER: DREDGING A dredge of the U.S. Army Corps of Engineers in operation on the Mississippi River near Vicksburg, Mississippi, making the channel of navigable depth. Photographed c.1970. / Bridgeman Images

GCL3401949: ARKANSAS: LEVEES, 1930s Construction of levees using dragline excavators at Arkansas City, Arkansas, on the Mississippi River, 1930s. / Bridgeman Images

GCL3401950: MISSISSIPPI RIVER: MATS A work crew on the banks of the Mississippi River installing mats made of branches cut from willow trees to help guard against flooding, near Vicksburg, Mississippi, early 1930s. / Bridgeman Images

GCL3401951: MISSISSIPPI RIVER: FLOOD Waters of the Mississippi River at flood level at Vicksburg, Mississippi. Photographed in 1973. / Bridgeman Images

GCL3401953: MISSISSIPPI RIVER: GRADING Riverbank grading along the Mississippi River near Port Gibson, Mississippi, part of the revetment process to help guard against flooding. Photographed c.1970. / Bridgeman Images

GCL3401959: CIVIL WAR: SOLDIERS, 1864 Two soldiers (probably Confederate) smoking pipes at Brandy Station, Virginia. Photograph, 1864. / Bridgeman Images

GCL3401974: ST. LOUIS: FLOOD, 1858 A view of the Mississipi River waterfront in St. Louis, Missouri, during a flood, 16 June 1858. / Bridgeman Images

GCL3401979: MISSISSIPPI FLOOD, 1927 Refugee camp on high ground at Arkansas City, Arkansas, at the time of the Great Mississippi River Flood, 5 May 1927. / Bridgeman Images

GCL3401993: ILLINOIS: FLOOD WALL A view of the gap in the flood wall in Cairo, Illinois, on Eighth Street, permitting access to the waterfront at the confluence of the Ohio and Mississippi Rivers. Photographed c.1970. / Bridgeman Images

GCL3401999: CIVIL WAR: NEWSPAPERMAN A newspaper man during the American Civil War. Photograph, c.1863. / Bridgeman Images

GCL3402000: CHARLES POMEROY STONE (1824-1887). American soldier, civil engineer and surveyor. Photographed as Brigadier General with his daughter Hettie, 1863. / Bridgeman Images

GCL3402002: CIVIL WAR: UNION SOLDIER Lieutenant Colonel Ferries Nazer of the 4th New York Cavalry. Photograph, c.1862. / Bridgeman Images

GCL3402013: ROBERT E. LEE (1807-1870) American Confederate general. Photograph, c.1865. / Bridgeman Images

GCL3402014: CIVIL WAR: UNION SOLDIER A Union Army Captain, c.1863. / Bridgeman Images

GCL3402019: EDWARD ORD (1818-1883) Edward Otho Cresap Ord. Union army officer. Photographed with his wife and daughter, c.1864. / Bridgeman Images

GCL3402033: MORDECAI BROWN (1876-1948) Known as 'Three Finger' Brown. American baseball pitcher. Baseball card while playing for the Chicago Cubs, 1911. / Bridgeman Images

GCL3402037: MORDECAI BROWN (1876-1948) Known as 'Three Finger' Brown. American baseball pitcher. Photographed while playing for the Chicago Cubs, 1911. / Bridgeman Images

GCL3402044: ROBERT ANDREWS MILLIKAN (1868-1953). American physicist. Photograph, early 20th century. / Bridgeman Images

GCL3402045: MICHAEL FARADAY (1791-1867) English chemist and physicist. Daguerreotype by Mathew Brady, c.1850. / Bridgeman Images

GCL3402049: SOUTH AFRICA: HOTTETNTOT 'The Kraals and Hutts of the Hottentots.' Khoikhoi (Hottentot) villagers building a dwelling. Line engraving from an English edition of Peter Kolbe's 'The Present State of the Cape of Good Hope,' 1731. / Bridgeman Images

GCL3402052: LEOPARDI: BAS-RELIEF Bronze bas-relief of Capilliata Colleoni, a Captain General of the Roman church under Pope Urban V, by Alessandro Leopardi, 16th century. / Bridgeman Images

GCL3402055: MAIANO: GIOTTO, c.1490 Bust and plaque of the early Renaissance artist, Giotto, by Benedetto da Maiano, at the Santa Maria del Fiore church in Florence, Italy, 15th century. / Bridgeman Images

GCL3402057: WASHINGTON, DC: CAR, c.1915 An automobile photographed in Washington, D.C., c.1915. / Bridgeman Images

GCL3402058: CAR ACCIDENT, c.1919 Men examining a wrecked car on the side of an American street. Photograph, c.1919. / Bridgeman Images

GCL3402060: CAR ACCIDENT, c.1919 Men examining a wrecked car on the side of a street. Photograph, c.1919. / Bridgeman Images

GCL3402065: SHRINER CONVENTION, 1923 Cars waiting for masonic leaders Esten A. Fletcher and Frank C. Jones at the Lincoln Memorial in Washington, D.C., during the Shrine convention in 1923. / Bridgeman Images

GCL3402068: AUTOMOBILE ENGINE Photograph, American, c.1915. / Bridgeman Images

GCL3402074: CAR AND BAKERY, c.1915 A car with an advertisement for Wirth's Bakery in front of the store on H Street in Washington, D.C., c.1915. / Bridgeman Images

GCL3402076: TRUCK, c.1915 Truck with an advertisement for the Southern Automobile Supply Company, in Washington, D.C., c.1915. / Bridgeman Images

GCL3403082: SCRAP MACHINERY, 1912 A pile of scrap machinery outside the Carolina Cotton Mill in Spartanburg, South Carolina. Photograph by Lewis Hine, May 1912., Hine, Lewis Wickes (1874-1940) / Bridgeman Images

GCL3403086: HINE: CHILD LABOR, 1912 A young cotton mill worker injured by a piece of machinery that fell on his foot causing him to land on the spinning machine which crushed and tore out his two middle fingers. There was no protective gear used at the cotton mill in Bessemer City, North Carolina. Photograph by Lewis Hine, October 1912., Hine, Lewis Wickes (1874-1940) / Bridgeman Images

GCL3403090: HINE: MILL HOUSING, 1912 Interior of a textile mill worker's home in Pawtucket, Rhode Island. Photograph by Lewis Hine, November 1912., Hine, Lewis Wickes (1874-1940) / Bridgeman Images

GCL3403127: ANTI-CHILD LABOR POSTER American poster about the hazards of using child labor, featuring photographs by Lewis Hine, c.1914., Hine, Lewis Wickes (1874-1940) / Bridgeman Images

GCL3403132: ANTI-CHILD LABOR POSTER American exhibit panel saying that children who work all day in cramped apartments can not thrive. Featuring photographs by Lewis Hine, c.1913., Hine, Lewis Wickes (1874-1940) / Bridgeman Images

GCL3403138: TLATILCO: LIFE & DEATH Ceramic mask, half-flesh and half-skull, representing the dualism between life and death. From Tlatilco, Mexico, 1100-600 B.C. / Bridgeman Images

GCL3403141: GALLO-ROMAN FIGURE Gallo-Roman terracotta figure of a mother goddess, from Toulon-sur-Allier, France, circa 1st-2nd century A.D. / Bridgeman Images