Vegetable productivity :  the role of vegetables in feeding people and livestock : proceedings of a symposium held at the Royal Geographical Society, London, on 27 and 28 September 1979 / 
edited by C. R. W. Spedding 
 - London :  MacMillan ,  1981 
 - xi , 268 p. ;  24 cm. 
 - Symposia of the Institute of Biology ;  no. 25 .
<br/><br/>Includes references 
<br/><br/><label>ISBN: </label>0333310918 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crop yield--Congresses