Twenty-fifth annual general meeting. 

 - Londres-XXK :   The Institution of Mining and Metallurgy,   1916. 
 - p. 3-12  
 - Irregular 
 - No. 139(Apr.1916) 
 - Bulletin of the Institution of Mining and Metallurgy,  ;   No. 139 .
 - Reino Unido.   The Institution of Mining and Metallurgy,. .
<br/><br/><br/>Inglés.