Modern coal mining methods.
Cita Chicago Style (17a ed.)Modern Coal Mining Methods. New York, N. Y. : published by Coal Age 330 west 42nd street, 19--.
Cita MLA (8a ed.)Modern Coal Mining Methods.
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Modern coal mining methods.
Cita Chicago Style (17a ed.)Modern Coal Mining Methods. New York, N. Y. : published by Coal Age 330 west 42nd street, 19--.
Cita MLA (8a ed.)Modern Coal Mining Methods.