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1922.
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English
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[1948]
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English
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University Press
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1958.
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English
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Cooper Square Publishers
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1966.
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1967.
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McGraw-Hill
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[1971]
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English
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1971.
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McGraw-Hill
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[1971]
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English
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University of Pennsylvania Press
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[1972]
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English
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Crowell
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[1974]
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English
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Harper & Row
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[1984]
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English
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[1987]
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English
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Leicester University Press
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1990.
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English
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University of Toronto Press
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1991.
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Published for the Centre for Medieval Studies by the Pontifical Institute of Mediaeval Studies
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[1991]
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English
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University of Minnesota Press
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[1992]
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English
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Cambridge University Press
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1992.
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English