Sinkankas, John <br/><br/>
Prospecting for gemstones and minerals indal 

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 - New York  Van Nostrand Reinhold Company  1970 
 - xviii,397p.   
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<br/><br/><label>Subjects--Index Terms: </label>Drilling and boring  Shaft sinking  Well boring  Boring  Wells  Hydraulic engineering  Mining Engineering  Tunnels  Water supply engineering 
<br/><br/><label>Dewey Class. No.: </label>622