Clarke, George Robin. <br/><br/>
The study of the soil in the field / 
by G. R. Clarke. 
 - 3rd ed. 
 - [London,   Oxford University Press,  1941. 
 - 227, [1] p. :  incl. tables, diagrs., forms. pl. ;  18 cm. 
<br/><br/> Field soil description sheet" laid in. 
<br/><br/>Some useful books" : p. 226-227. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soils--Research