Williamson, A. W. <br/><br/>
Cottonwood in the Mississippi valley  / 
by A. W. Williamson 
 - Washington  :   Department of Agriculture 
 - 62 p. + 6 láms. 
 - EUA. Dep. of Agr. Bull.; 24 .
<br/><br/><label>LCCN: </label>203997 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chopo