Langer, Susanne K.
Philosophical sketches
John Hopkins Press, 1964
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Descartes philosophical writings
selected and translated by Norman Kemp Smith
Modern Library, 1958
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Classic philosophical questions
editor, James A. Gould
Charles E. Merrill , 1971
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Hospers, John
An Introduction to philosophical analysis
Roudledge, 1988
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Cornman, James W.
Philosophical problems and arguments: an introduction
Macmillan, 1968
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