Trewartha-James, W. H. <br/><br/>
Bulletin of the Institution of Mining and Metallurgy,  ;   No. 136 

 - Londres-XXK :   The Institution of Mining and Metallurgy,   1916. 
 - p. 1-6 :   il. 
 - Irregular 
 - No. 136(Jan.1916) 
 - Bulletin of the Institution of Mining and Metallurgy,  ;   No. 136 .
 - Reino Unido.   The Institution of Mining and Metallurgy,. .