Vacca, John R., <br/><br/>
The world's 20 greatest unsolved problems /  
John R. Vacca. 
 - First Edition. 
 - xxxii, 669 pages ;  24 cm. 
<br/><br/><label>ISBN: </label>0131426435 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural Sciences
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Natural sciences.
<br/><br/><label>Dewey Class. No.: </label>500  / V113