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Sand Springs

(Encyclopedia)Sand Springs, city (1990 pop. 15,346), Tulsa co., NE Okla., an industrial suburb of Tulsa, on the Arkansas River; founded 1907. There are oil and natural-gas wells and food-processing and chemical ind...

Silver Springs

(Encyclopedia)Silver Springs, mineral spring, N central Fla., source of the Silver River. The limestone spring, one of the world's largest and most famous, has a basin 80 ft (24 m) deep and 300 ft (91 m) wide. The ...

Dry Tortugas National Park

(Encyclopedia)Dry Tortugas National Park: see under Dry Tortugas. ...

Crater Lake National Park

(Encyclopedia)Crater Lake National Park, 183,224 acres (74,206 hectares), SW Oreg., in the Cascade Range; est. 1902. Crater Lake, 20 sq mi (52 sq km), lies in a huge pit that was created when the top of a prehistor...

Cuyahoga Valley National Park

(Encyclopedia)Cuyahoga Valley National Park kīˌəhōˈgə [key], 32,950 acres (13,334 hectares), in the Cuyahoga River valley between Akron and Cleveland, NE Ohio; est. as a national recreation area 1974, designa...

Colonial National Historical Park

(Encyclopedia)Colonial National Historical Park, 9,350 acres (3,785 hectares), SE Va., mainly on the peninsula between the York and James rivers; created 1930 as Colonial National Monument, renamed 1936. The park e...

Channel Islands National Park

(Encyclopedia)Channel Islands National Park: see Channel Islands, California; National Parks and Monuments (table)national parks and monuments (table). ...

Elk Island National Park

(Encyclopedia)Elk Island National Park, 75 sq mi (194 sq km), central Alta., Canada, near Edmonton; est. 1913. It occupies a wooded rolling region in the midst of level farmland. The park is Canada's major fenced p...

Isle Royale National Park

(Encyclopedia)Isle Royale National Park roiˈəl [key], 571,790 acres (231,575 hectares), comprising about 200 islands, in Lake Superior, NW Mich.; est. 1940. Isle Royale, 210 sq mi (544 sq km), is the largest isla...

Independence National Historical Park

(Encyclopedia)Independence National Historical Park: see National Parks and Monuments (table)national parks and monuments (table). ...