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The clean and efficient use of coal and lignite
its role in energy, environment and life ; Hong Kong, 30th November - 3rd December 1993 ; conference proceedings -
The clean and efficient use of coal and lignite
its role in energy, environment and life ; Hong Kong, 30th November - 3rd December 1993 ; conference proceedings -
The clean and efficient use of coal and lignite
its role in energy, environment and life ; Hong Kong, 30th November - 3rd December 1993 ; conference proceedings