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Mississippi National River and Recreation Area

(Encyclopedia)Mississippi National River and Recreation Area: see National Parks and Monuments (table)national parks and monuments (table). ...

Upper Delaware Scenic and Recreational River

(Encyclopedia)Upper Delaware Scenic and Recreational River: see National Parks and Monuments (table)national parks and monuments (table). ...

Perry's Victory and International Peace Memorial

(Encyclopedia)Perry's Victory and International Peace Memorial: see National Parks and Monuments (table)national parks and monuments (table). ...

Oregon Caves National Monument and Preserve

(Encyclopedia)Oregon Caves National Monument and Preserve: see National Parks and Monuments (table)national parks and monuments (table). ...

Aniakchak National Monument and Preserve

(Encyclopedia)Aniakchak National Monument and Preserve ănēăkˈchăk [key], on the Alaska Peninsula, SW Alaska. Located in the Aleutian Range, the monument (137,176 acres/55,556 hectares) and surrounding preserve...

Denali National Park and Preserve

(Encyclopedia)Denali National Park and Preserve dənälˈē [key], in the Alaska Range, S central Alaska; comprising Denali National Park (4,740,912 acres/1,919,398 hectares), est. as Mt. McKinley National Park 191...

equivalent weight

(Encyclopedia)equivalent weight. The equivalent weight of an element or radical is equal to its atomic weight or formula weight divided by the valence it assumes in compounds. The unit of equivalent weight is the a...

Dalton, John

(Encyclopedia)Dalton, John dôlˈtən [key], 1766–1844, English scientist. He revived the atomic theory (see atom), which he formulated in the first volume of his New System of Chemical Philosophy (2 vol., 1808�...