Field modifications of tractors; conference proceedings 

 - St. Joseph, Mich.,  (1967) 
 - 42 p.  : ilus. ; gráfs 
 - ASAE. Publication PROC-467 .
 - ASAE. Publication PROC-467 .
<br/><br/><label>LCCN: </label>19537 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tractores.