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America's Most Endangered Places 2006

The Smithsonian Institution and the World Trade Center stairs are considered endangered properties by Mark Zurlo Arts and Industries Building of Smithsonian Institution, Washington DC.…

Silurian period

(Encyclopedia) Silurian period sloor´n, s– [from the Silures, ancient tribe of S Wales, where the period was first studied; named by the British geologist R. I. Murchison], third period of the…