CUMMINS, A. B. Sosiety of mining engineering (SME) handbook. Volume I. Society of Mining Engineers.
Lua i Stíl Chicago (17ú heag.)CUMMINS, Arthur B. Sosiety of Mining Engineering (SME) Handbook. Volume I. Society of Mining Engineers.
Lua MLA (8ú heag.)CUMMINS, Arthur B. Sosiety of Mining Engineering (SME) Handbook. Volume I. Society of Mining Engineers.
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