Mineka, Francis E. and Lindley, Dwight N., eds. 1972. The later letters of John Stuart Mill, 1849–1873. Vol. 15 of The collected works of John Stuart Mill, edited by F. E. L. Priestley and J. M. Robson. 33 vols. Toronto: University of Toronto Press. London: Routledge & Kegan Paul. 1963–91.
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