Clarke, G. R. <br/><br/>
Study of soil in the field 
by G. R. Clarke ; assisted by Philip Beckett 
 - 5th ed. 
 - Oxford  Clarendon Press  1971[reprinted 1974] 
 - vi,144p.:ill.; 22cm. 
<br/><br/><label>Dewey Class. No.: </label>581.5  / CLA