Pear production / 
by Max W. Williams [et. al.] 
 - Washington :   Science and Education Administration 
 - 53 p. 
 - Agriculture handbook; 526 .
<br/><br/><label>LCCN: </label>205213 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pera -- crecimiento<br/>Pera -- enfermedades <br/>Pera -- plagas