Origins of pest, parasite, disease and weed problems :    the 18th Symposium of the British Ecological Society, Bangor, 12-14 April 1976 / 
edited by J.M. Cherrett and G. R. Sagar 
 - Oxford :    Blackwell Scientific Publications,    1977. 
 - 413 p. :   ill. ;    24 cm . 
<br/><br/>Includes references and index. 
<br/><br/><label>ISBN: </label>0632002263 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Field crops--Diseases and pests--Congresses..<br/>Weeds--Congresses.<br/>Veterinary medicine--Congresses.