Abstract
THE economic importance of coal we perhaps realise. It is the only raw material we produce in great quantity; the value of our total mineral output in 1913 was above 160,000,00lā;.; of this the value of the coal at the mine was above 145,500,000
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Coal and its Economic Utilisation 1 . Nature 98, 500ā502 (1917). https://doi.org/10.1038/098500b0
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DOI: https://doi.org/10.1038/098500b0