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Hoover Dam

(Encyclopedia)Hoover Dam, 726 ft (221 m) high and 1,244 ft (379 m) long, on the Colorado River between Nev. and Ariz.; one of the world's largest dams. Built between 1931 and 1936 by the U.S. Bureau of Reclamation,...

Glen Canyon Dam

(Encyclopedia)Glen Canyon Dam, 710 ft (216 m) high, 1,560 ft (475 m) long, NE Ariz., on the Colorado River. The key unit of the U.S. Bureau of Reclamation's Colorado River storage project, it is one of the world's ...

pony express

(Encyclopedia)pony express, in U.S. history, relay mail service. At its inception in Apr., 1860, the pony express operated between St. Joseph, Mo., the western end of a telegraph line, and Sacramento, Calif. Riders...

Marietta

(Encyclopedia)Marietta mârēĕtˈə [key]. 1 City (1990 pop. 44,129), seat of Cobb co., NW Ga.; inc. 1834. The principal manufactures of this suburb of Atlanta are related to aircraft production. At the foot of Ke...

cemetery

(Encyclopedia)cemetery, name used by early Christians to designate a place for burying the dead. First applied in Christian burials in the Roman catacombs, the word cemetery came into general usage in the 15th cent...

Mather, Stephen Tyng

(Encyclopedia)Mather, Stephen Tyng, 1867–1930, American industrialist and environmentalist, b. San Francisco, grad. Univ. of California, Berkeley, 1887. He began working for the Pacific Coast Borax Company in the...

Fredericksburg

(Encyclopedia)Fredericksburg. 1 Town (2020 pop. 10,875), Gillespie co., S central Texas, in the Texas Hill Country near the Pedernales River; inc. 1928. Located in an...

Yellowstone National Park

(Encyclopedia)Yellowstone National Park, 2,219,791 acres (899,015 hectares), the world's first national park (est. 1872), NW Wyo., extending into Montana and Idaho. It lies mainly on a broad plateau in the Rocky Mt...

Freedom Riders

(Encyclopedia)Freedom Riders, American civil-rights demonstrators who engaged (1961) in nonviolent protests against segregation of public interstate buses and terminals in the South. From the 1940s several federal ...

Chattanooga

(Encyclopedia)Chattanooga chătˌəno͞oˈgə [key], city (2020 pop. 181,099), seat of Hamilton co., E Tenn., on both ...