Agricultural efficiency :  a Royal Society discussion on the management of inputs for yet greater agricultural yield and efficiency / 
organized by G.W. Cooke, N.W. Pirie & G.D.H. Bell. 
 - London :  The Royal Society,  1977. 
 - 301 p. 
<br/><br/><label>ISBN: </label>0854030956 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture--Economic aspects.--Great Britain