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John D. Rockefeller, Jr., Memorial Parkway

(Encyclopedia)John D. Rockefeller, Jr., Memorial Parkway, Wyo.: see National Parks and Monuments (table)national parks and monuments (table). ...

Juan Bautista de Anza National Historic Trail

(Encyclopedia)Juan Bautista de Anza National Historic Trail: see National Parks and Monuments (table)national parks and monuments (table). ...

Wolf Trap National Park for the Performing Arts

(Encyclopedia)Wolf Trap National Park for the Performing Arts: see National Parks and Monuments (table)national parks and monuments (table). ...

War in the Pacific National Historical Park

(Encyclopedia)War in the Pacific National Historical Park: see National Parks and Monuments (table)national parks and monuments (table). ...

Cane River Creole National Historical Park and Heritage Area

(Encyclopedia)Cane River Creole National Historical Park and Heritage Area: see National Parks and Monuments (table)national parks and monuments (table). ...

Big South Fork National River and Recreation Area

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

lanthanum

(Encyclopedia)lanthanum lănˈthənəm [key] [Gr.,=to lie hidden], metallic chemical element; symbol La; at. no. 57; at. wt. 138.90547; m.p. about 920℃; b.p. about 3,460℃; sp. gr. 6.19 at 25℃; valence +3. Lan...

argon

(Encyclopedia)argon ärˈgŏn [key] [Gr.,=inert], gaseous chemical element; symbol Ar; at. no. 18; at. wt. 39.948; m.p. −189.2℃; b.p. −185.7℃; density 1.784 grams per liter at STP; valence 0. Argon is a col...

rubidium

(Encyclopedia)rubidium ro͞obĭdˈēəm [key], metallic chemical element; symbol Rb; at. no. 37; at. wt. 85.4678; m.p. 38.89℃; b.p. 686℃; sp. gr. 1.53 at 20℃; valence +1. Rubidium is a very soft silver-white ...

promethium

(Encyclopedia)promethium prōmēˈthēəm [key], artificially produced radioactive chemical element; symbol Pm; at. no. 61; mass no. of most stable isotope 145; m.p. 1,042℃; b.p. 3,000℃ (estimated); sp. gr. unk...