In situ investigations in soils and rocks :  proceedings of the Conference organized by the British Geotechnical Society in London, 13-15 May, 1969. 

 - London :  British Geotechnical Society,  1970. 
 - 323 p. :  ill. ;  30 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soils--Testing--Congresses.<br/>Rocks--Testing--Congresses.