Pickering R. G. B. & The South African Institute of Mining and Metallurgy. The optimization of mining method and equipment.
Lua i Stíl Chicago (17ú heag.)Pickering R. G. B. agus The South African Institute of Mining and Metallurgy. The Optimization of Mining Method and Equipment.
Lua MLA (9ú heag.)Pickering R. G. B. agus The South African Institute of Mining and Metallurgy. The Optimization of Mining Method and Equipment.
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