United Nations Economic Commission For Europe And Agriculture Organization <br/><br/>
Protein and non-protein nitrogen for ruminants. 

 - Oxford  Pergamon Press        1977 
 - 182p.  cm. 
<br/><br/><label>Standard No.: </label>28653 
<br/><br/><label>Source: </label> Annuals, Advances 
<br/><br/><label>Dewey Class. No.: </label>KX31:1(E92Z2)p1,N77, L7