P.F. Wareing 
Potential crop production : A case study 
 - London  Heinemann Educational Books  1971 
 - 385p 
P.F. Wareing & J.P. Cooper: Potential crop production : A case study.  London.  Heinemann Educational Books, 1971. 0 435 62990 5--(633WAR)   
ENGLISH 
0 435 62990 5 
633  / WAR