TY  - BOOK
AU  - Chugh, Chandra Parkash.
TI  - Drilling technology hand book
U1  - 621.95(02) L7 
PY  - 1977///
CY  - New Delhi
PB  - Oxford & IBH
KW  - Chandra Parkash Chugh
KW  - Drilling,Hand books
ER  -