Virus diseases of apples and pears /
Edited by A. F. Posnette.
|Main Author:||Posnette, A. F.|
Farnham Royal, Bucks, Eng. : Commonwealth Agricultural Bureaux, 
Virus diseases of plants
Pear > Pear / Diseases and pests
Apples > Apples / Diseases and pests.
Supplement (no. 1), issued in 1967, bound with main work.
141 p. :
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