Diamond Drilling for Gold and Other Minerals; A Practical Handbook on the Use of Modern Diamond Core Drills in Prospecting and Exploiting Mineral-Bear
 »

Diamond Drilling for Gold and Other Minerals; A Practical Handbook on the Use of Modern Diamond Core Drills in Prospecting and Exploiting Mineral-Bearing Properties, Including Particulars of the Cost of Apparatus and of Working
 »

The Deep-Level Mines Of The Rand And Their Future Development: Considered From The Commercial Point Of View
Considered From The Commercial Point Of View »

Diamond Drilling For Gold And Other Minerals: A Practical Handbook On The Use Of Modern Diamond Core Drills In Prospecting And Exploiting Mineral-Bear
 »

Diamond Drilling For Gold And Other Minerals
A Practical Handbook On The Use Of Modern Diamond Core Drills In Prospecting And Exploiting Mineral-Bearing Properties, Including Particulars Of The Cost Of ... »

Deep-Level Mines of the Rand and Their Future Development
Considered from the Commercial Point of View »

Diamond Drilling For Gold And Other Mine
 »

Klerksdorp Gold Fields; Being A Description Of The Geologic And Of The Econonic Conditions Obtaining In The Klerksdorp District, South
 »