The agricultural tractor 1855-1950 / 
compiled R.B. Gray 
 - St Joseph :  American Society of Agricultural Engineers,  1975 
 - 60 pages :  illustrations ;  28 cm 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural machinery<br/>Tractors --History
<br/><br/><label>Subjects--Geographic Terms: </label>--History--United States 
<br/><br/><label>LC Class. No.: </label>S711 A37