Porter, Keith S. <br/><br/>
Nitrogen and phosphorus: food production waste, and environment 

 - Michigan  Ann Arbor Science Publishers  1975 
 - xi,372p.  24cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural wastes as feed
<br/><br/><label>LC Class. No.: </label>TD930.N57