Van Der Wal, H.R.
Prospecting Offshore Placers: Drilling Ships, Equipment and Positioning Techniquies by H.R. Van Der Wal - 1st. ed - Bangkok, Thailand Commitee for Co-Ordination of Joint Prospecting for Mineral Resources in Asian Areas (CCOP) 1980 - 94p ill 1980
Economic geology--Drill equipment and Offshore Placers--Asian
Prospecting Offshore Placers: Drilling Ships, Equipment and Positioning Techniquies by H.R. Van Der Wal - 1st. ed - Bangkok, Thailand Commitee for Co-Ordination of Joint Prospecting for Mineral Resources in Asian Areas (CCOP) 1980 - 94p ill 1980
Economic geology--Drill equipment and Offshore Placers--Asian