Langdon John <br/><br/>
Horses, oxen and technological innovation    The us    
Langdon John 
 - Cambridge  Cambridge university press          1986 
 - xvi, 331p.  cm. 
<br/><br/> Past and present publications. 
<br/><br/><label>ISBN: </label>0521267722 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture Industries
<br/><br/><label>Dewey Class. No.: </label>X9(J)0gF.3.J00<-E66, M6