TY  - BOOK
ED  - Petroleum Extension Service
ED  - International Association of Drilling Contractors, IADC
ED  - International Association of drilling contractors, IADC
TI  - Guide to safe stairways, walkways, and railings
U1  - 620.86 P497 0011742 
PY  - 1978///
CY  - Austin, Texas
PB  - Petroleum Extension Service
KW  - Seguridad en perforación de pozos
ER  -