Danhof, Clarence H. <br/><br/>
Change in Agriculture :  the Northern United States, 1820-1870 / 
Clarence H. Danhof. 
 - Cambridge, Mass. :  Harvard University Press,  c1969. 
 - xii, 322p. 
<br/><br/><label>ISBN: </label>674107705 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Changes in Agriculture.