Helicon, V.B. <br/><br/>
Fact on File Encyclopedia of Science 

 - 1st ed. 
 - New York  Facts On File Inc  1999 
 - 424p.,424p. 
 - vol..II L - Z .
<br/><br/><label>ISBN: </label>816040087 
<br/><br/><label>Dewey Class. No.: </label>503  / HEL/RNC