O'Brien, Robert. <br/><br/>
Machines 
Robert O'Brien and the editors of Life. 
 - Alexandria, Va.,  Time- Life Books  1980. 
 - 200 p.  illus. (some col.). 
 - Life science library .
<br/><br/><label>LCCN: </label>80052116  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Machinery
<br/><br/><label>LC Class. No.: </label>TJ147  / .O2 1980 
<br/><br/><label>Dewey Class. No.: </label>J  / 621  / O13