Crop productivity 

 - Tokyo  Butterworth Heinemann  1994 
 - x,282p.: ill.;  Pbk. 
<br/><br/><label>ISBN: </label>0750605626 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural productivity -- Programmed instructive <br/>Crop yields -- Programmed instruction
<br/><br/><label>LC Class. No.: </label>S494  / .C7 1994