Answers are grounded in this paper and cite their sources.
(1967). Lignite and the Derived Steam-Activated Carbon. Archives of Environmental Health: An International Journal: Vol. 14, No. 3, pp. 450-460.
No takes yet. Share an insight, caveat, or question.
Gross et al. (1967) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: