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Coal revisited
Landsberg, Hans H., (1988)
Report on the Cahaba Coal Field
Squire, Joseph, (1890)
Competitiveness of Queensland thermal coals in the export market : final report
(1998)
Coal, lignite, peat
Louis, Henry, (1924)
[Besprechung:] Henry, Louis: Population. Analysis and models. London 1976
Kelly, William J., (1978)
Mineral Deposits
Louis, Henry, (1934)