631.4/4 <br/>

                  Keys to soil taxonomy / 
by Soil Survey Staff. 
 - 6th ed. 
 - [Washington, D.C.] :  United States Dept. of Agriculture, Soil Conservation Service,  1994. 
 - iv, 306 p. ;  28 cm. -
<br/><br/> "This volume includes all revisions of the keys that have so far been approved, replacing the original keys in Soil taxonomy, a basic system of soil classification ... (1975), the work on which this abridged version, first published 1983 is based"--P. ii. 
Includes bibliographical references and index. <br/>
<br/><br/><label>LCCN: </label>94224515  
<br/><br/>                 <label>Түлхүүр үг: </label>Soils, Classification.
<br/><br/><label>LC Class. No.: </label>S592.16  / .K49 1994