International Energy Agency & IEA International Conference on Clean and Efficient Use of Coal and Lignite: Its Role in Energy, Environment and Life. (1994). 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 Agency ; OECD Publications and Information Centre [distributor].

International Energy Agency agus Environment and Life IEA International Conference on Clean and Efficient Use of Coal and Lignite: Its Role in Energy. 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. Paris, France : Washington, D.C.: The Agency ; OECD Publications and Information Centre [distributor], 1994.

International Energy Agency agus Environment and Life IEA International Conference on Clean and Efficient Use of Coal and Lignite: Its Role in Energy. 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 Agency ; OECD Publications and Information Centre [distributor], 1994.