TY  - SER
AU  - Beringer, J. J.
TI  - Bulletin of the Institution of Mining and Metallurgy,  ; 
T2  - Bulletin of the Institution of Mining and Metallurgy,  ; 
PY  - 1915///
CY  - Londres-XXK : 
PB  - The Institution of Mining and Metallurgy, 
ER  -