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Reproduced with permission of the Royal Society of Chemistry from the RSC Journals Archive. and http://www.rsc.org/publishing/journals/article.asp?doi=TF9494500274/
Periodical. Franklin, Rosalind. "A Study of the Fine Structure of Carbonaceous Solids by Measurements of True and Apparent Densities: Part I. Coals." Transactions of the Faraday Society 45, (1949): 274-286. Article. 13 Images.. Transactions of the Faraday Society