Orlov, D. S. <br/><br/>
Humus acid of soils 
by D.S. Orlov 
 - Rotterdam :  Balkema,  1986 
 - 378 p.  : ilus. ; gráfs. 
 - Russian translation series  ; 35 .
 - Russian translation series  ; 35 .
<br/><br/><label>LCCN: </label>60606 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Acido humico.<br/>Humus.<br/>Suelos--Fertilidad.
<br/><br/><label>Dewey Class. No.: </label>631.45  / O74Y