Artificial manures, or, the conservation and use of organic matter for soil improvement 
Arthur B. Beaumont 
 - Nueva York  Orange Judd  1944 
 - 155 p.  il.  20 cm. 
<br/><br/> Incluye tabla de ilustraciones y glosario  I177 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Abonos<br/>Suelos