Rahn, Joan Elma <br/><br/>
The metric system. / 
Joan Elma Rahn. 
 - New York :  Atheneum,  1976. 
 - 79 p. 
<br/><br/><label>ISBN: </label>0-689-30510-9 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Metric system