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Science » Applied Sciences » Engineering

Built in America: Historic American Buildings Survey/Historic American Engineering Record, 1933-Present

documents the achievements in architecture, engineering, and design in the U.S., including examples as diverse as windmills, one-room schoolhouses, the Golden Gate Bridge, and buildings designed by Frank Lloyd Wright. The site offers searches to thousands of drawings, large-format photographs, and written histories for more than 35,000 historic structures and sites dating from the 17th to the 20th century. (Library of Congress)

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This beautiful freestanding spiral staircase climbs from the first floor to the attic of the Captain Charles L. Shrewsbury House.  General view of circular stair, first floor, from the north. Photogra

Freestanding spiral staircase

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