TY  - BOOK
AU  - Chugh, Chandra Prakash.
TI  - Drilling technology handbook
U1  - 622.23 
PY  - 1977///
CY  - New Delhi
PB  - Oxford and IBH Publishing Co.
KW  - Drilling and boring (Earth, rocks, metals)- Handbook
KW  - Drilling technology - Handbook
ER  -