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Drilling muds --- Effluent quality --- Oil field chemicals --- Oil well drilling --- Water --- Standards --- Pollution --- Point source identification.
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Drilling muds --- Effluent quality --- Oil field chemicals --- Oil well drilling --- Water --- Standards --- Pollution --- Point source identification.
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Drilling muds --- Effluent quality --- Oil field chemicals --- Oil well drilling --- Water --- Environmental aspects --- Standards --- Pollution --- Point source identification.
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