Ray, Howard E.  Dr. <br/><br/>
Soil fertility evaluation for increased farm production and profits/ 
Howard E. Ray and E.K.S. Nambiar 
 - New Delhi:  Fertiliser Association of India,  1972 
 - 48 p.;  21 cm. 
<br/><br/><label>ISBN: </label> Rs. 3.00 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil fertility--Research<br/>Soil conservation<br/>Soil productivity
<br/><br/><label>Dewey Class. No.: </label>631.45