Tractors and their power units 
John B. Liljedahl ... [et al.] 
 - 3d ed. 
 - New York  Wiley  c1979 
 - xvii, 420 p.  ill.  24 cm. 
<br/><br/> First-2d ed. by E. L. Berger, and others 
<br/><br/><label>Dewey Class. No.: </label>629.22  / 5