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The top documents tagged [shallow coal]
Forms and Sources of Energy. Energy Energy is the ability of a physical system to do work or exert force Energy is the ability of a physical system to
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-Kazem Oraee (Prof) - Arash Goodarzi (Eng) - Nikzad Oraee-Mirzamani (Phd) -Parham Khajehpour (Eng) 34th International Conference on Ground Control in Mining
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