The mining journal, Raiway & commercial gazette ;   no.4854 

 - London-GB :   The mining journal,   1928. 
 - página 754 :   ilustraciones blanco y negro 
 - Irregular 
 - Vol. CLXII, no.4854 (Sep. 1928) 
 - The mining journal, Raiway & commercial gazette ;   no.4854 .
 - The mining journal. .