Clarke, George Robin. <br/><br/>
The study of the soil in the field / 
G.R. Clarke 
 - 4th edition 
 - Oxford :  Clarendon Press,  1957. 
 - 204 p. :  ill. ;  23 cm. 
<br/><br/> Contents<br/><br/>Soil site characteristics<br/><br/>Soil profile pit<br/><br/>Soil sampling<br/><br/>Soil survey and mapping<br/><br/>The use of air photographs for soil survey purposes<br/><br/>Main points in some systems of soil mapping and classification 
<br/><br/>Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soils--Research.<br/>Soil surveys.
<br/><br/><label>Dewey Class. No.: </label>631.47  / CLA