TY  - BOOK
AU  - Gy P M
TI  - Sampling of particulate materials: Theory and practice
T2  - Development in geomathematics; 4
U1  - HZ:f3, L9;1 
PY  - 1979///
CY  - Amdterdam
PB  - Elsevier Scientific        
KW  -  Ores-sampling and estimation
KW  - Geology
ER  -