Não informado. (1944). Drilling contractor. American Association of Oilwell Drilling Contractors.
Citace podle Chicago (17th ed.)Não informado. Drilling Contractor. Dallas, Tex: American Association of Oilwell Drilling Contractors, 1944.
Citace podle MLA (8th ed.)Não informado. Drilling Contractor. American Association of Oilwell Drilling Contractors, 1944.
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