How did they build that?  Iron and steel /  [videorecording] 
 Iron and Steel 
Ideal World production for the Discovery Channel ; producers, Scott Steedman & Paul Murray ; director, Ben Anthony. 
 - New Jersey :  Shopware,  c1998. 
 - 1 videocassette (24 min.) :  sd., col. ;  1/2 in. 
<br/><br/> This video takes a close look at how engineers have solved numerous problems using iron and steel, developing cantilever bridges, domes, foundations, arches, suspension bridges, underground spaces and more. 
<br/><br/><br/>VHS. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bridges--Design and construction.<br/>Bridge designs.
<br/><br/><label>Dewey Class. No.: </label>624.2  / HOW