| Registros del 1 al 2 de 2 encontrados |
1.- Coal classification
Carpenter, Anne M; Reino Unido
London: IEA Coal Research, 1988
IEA Coal Research
IV / 9 - 7 - 26|
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2.- Report of the fuel research board for the years 1920, 1921
Department of Scientific and Industrial Research; Reino Unido
London: Hes Majesty's Stationery Office, 1922
C 471 - 30
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