Virus diseases of apples and pears  

 - Farnham Royal:   Commonwealth Agriculture Bureaux,   1963 
 - xi, 141p. 
 -  Commonwealth bureau of horticulture and plantation crops  30 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture 
<br/><br/><label>Subjects--Index Terms: </label>Fruit symptoms  Leaf symptoms