Staff, Soil Survey, <br/><br/>
Keys to soil taxonomy / 
By soil survey staff 
 - 4 
 - 422 páginas 
 - Smss technical monograph ;  no. 19 .
<br/><br/><label>ISBN: </label>0929900014 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Taxonomía
<br/><br/><label>LC Class. No.: </label>QH84.8  / S73 1990