Não informado. (1960). The Mining Engineer. Institution of Mining Engineers.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. The Mining Engineer. London: Institution of Mining Engineers, 1960.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. The Mining Engineer. Institution of Mining Engineers, 1960.
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