4. Boring or penetrating the earth
  5. Processes
  6. Sampling of earth formations
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Dai Gesheng

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Dalton Michael Reginald

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David Ramon R.

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Davis J. Stanley

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Deguchi Shigeru

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Dekoster Claude

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Desrochers Gerard

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Diamond Oil Well Drilling

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Diamond Oil Well Drilling Co.

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Dolman Lee

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Donovan William S.

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Donovan Brothers Incorporated

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