How stuff works:  water, salt, wheat, rubber/ 

 - United States:  Discovery Channel,  c2012. 
 - 1 videodisc:  sound,color;  4 3/4 in. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water<br/>Salt.<br/>Wheat<br/>Rubber<br/>Corn<br/>Timber<br/>Aluminum<br/>Steel
<br/><br/><label>Dewey Class. No.: </label>AV 600 H847 2012