O'Brien, Robert,  1911- <br/><br/>
Machines / 
by Robert O'Brien 
 - New York :  Time, inc.,  c1965 
 - 200 p. :  ill. (part col.) ports. ;  28 cm. 
 - Life science library .
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label> PND 2.90 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Machinery
<br/><br/><label>Dewey Class. No.: </label>621.9