Abstract
AN adequate and reasoned reply to Prof. Bone's letter would require more space than, as I am given to understand, NATURE can afford; I must, therefore, let the statements in my article, which I endeavoured to make in a critical and impartial spirit, speak for themselves.
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LESSING, R. The Classification of Coals. Nature 135, 911 (1935). https://doi.org/10.1038/135911a0
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DOI: https://doi.org/10.1038/135911a0