Nitrogen and phosphorus:  food production, waste and the environment/ 
edited by Keith S. Porter 
 - Michigan:  Ann Arbor Science Pub.,  c1975 
 - 372 p.:  ill., maps;  24 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0250401118  $ 24.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Waste products as fertilizers<br/>Nitrogen fertilizers<br/>Phosphatic fertilizers<br/>Agricultural productivity<br/>Agricultural wastes--Address, Essays, lectures etc.
<br/><br/><label>Dewey Class. No.: </label>631.84