'(<a href="http://www.j-archive.com/media/2006-03-21_J_17.jpg" target="_blank">Cheryl of the Clue Crew reads in front of the Pentagon.</a>)  The Pentagon was constructed primarily with this building material; steel was saved for the 2nd World War effort'
(reinforced) concrete
THE MATERIAL WORLD: The Pentagon was constructed primarily with this building material; steel was saved for the 2nd World War effort
The Pentagon was constructed primarily with this building material; steel was saved for the 2nd World War effort
The Pentagon was constructed primarily with this building material; steel was saved for the 2nd World War effort
THE MATERIAL WORLD
reinforced concrete
THE MATERIAL WORLD