Wheler, A. S. <br/><br/>
Bulletin of the Institution of Mining and Metallurgy,  ;   No. 142 

 - Londres-XXK :   The Institution of Mining and Metallurgy,   1916. 
 - p. 1-3 :   il. 
 - Irregular 
 - No. 142(Jul.1916) 
 - Bulletin of the Institution of Mining and Metallurgy,  ;   No. 142 .
 - Reino Unido.   The Institution of Mining and Metallurgy,. .