TY  - BOOK
AU  - Agard, J. 
TI  - International Geological Congress : report of the eighteenth session, Great Britain, 1948. Part 7. Symposium and proceed. of sect. F. The geology, paragenesis and reserves of the ores of lead and zInc
PY  - 1950///
CY  - London : 
PB  - International Geological Congress, 
ER  -