How stuff works:  corn, timber, aluminum, steel/ 

 - Silver Spring, Md.:  Discovery Communications, LLC,   ©2009 
 - 1 videodisc:  sound, color ;   4 3/4 in. 
<br/><br/><br/>Subtitles in English for the deaf and hard-of-hearing. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Corn -- Economic aspects.     Timber.     Aluminum. 
<br/><br/><label>Dewey Class. No.: </label>AV 600  / H847 2012