Soil survey field handbook; describing and sanpling soil profiles. / 
compilado por Hodgson, J. M. 
 - Harpenden, Scotland :  Rothamsted Experimental Station,  1974. 
 - 99 p. :  : ilus. ; gráfs. 
<br/><br/><label>LCCN: </label>16082 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Levantamiento topográfico.