Gray, R. B. <br/><br/>
The agricultural tractor, 1855-1950 

 - St. Joseph, Mich., :  American Society of Agricultural Engineers,  1974(c.1954) 
 - Pág. varía ilus 
<br/><br/><label>LCCN: </label>15151 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Maquinaria agrícola--Historia.<br/>Tractores.
<br/><br/><label>Dewey Class. No.: </label>631.372  / G7