1.
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London : Smith, Elder & Co., 1844 (Stewart & Murray)
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2.
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3.
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London : Methuen, 1909 (Edinburgh : Morrison & Gibb, Ltd.)
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4.
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London ; New York : Routledge, 1991.
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5.
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Indianapolis, The Bobbs-Merrill Company [c1928]
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6.
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[Chicago] University of Chicago Press [1974, c1958]
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