Knowles,Frank <br/><br/>
A practical course in agricultural chemistry  for senior students of agriculture, dairying, horticulture and poultry husbandry 
Frank Knowles,J. Elphin Watkin, with a foreword by Sir John Russell. 
 - London  Macmillan  1960 
 - xi,216 p.  ill  22 cm. 
<br/><br/> Includes index:p.212-216 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural chemistry