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1.- 8th International conference on coal science, September, 10-15, 1995. Oviedo,Spain. Programa y abstracts
IEA Coal Research; Congreso - International Conference on Coal Science (8. 1995. Oviedo)
Oviedo: El Congreso, 1995
I / 15 - 2 - 4
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2.- Coal research projects, 1988
Agencia Internacional de la Energía; IEA Coal Research
London: IEA, Coal Research, 1988
IV / 10 - 7 - 8
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