Keys to soil taxonomy by soil survey staff  Fourth ed. 
prepared by Crop and Soil Environmental Sciences Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA 
 - [Fourth Edition] 
 - Virginia, USA  Virginia Polytechnic Institute and State University  1990 
 - 422p.  23 cm 
<br/><br/> SMSS Technical Monograph No. 19 
<br/><br/><label>ISBN: </label>0929900014 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil--Taxonomy