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13. 
Cover image for Drilling and blasting technology
14. 
Cover image for Map showing geology and locations of hydrologic data sites, Burnt River valley, Oregon
15. 
Cover image for Mineral formation and structure in the electrochemical induration of weak rocks
16. 
Cover image for Electrochemical induration of weak rocks
17. 
Cover image for Wells and bore-holes for water supply : with notes on water analysis and purification
18. 
Cover image for Novel drilling techniques