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THOMAS, Norman L.. (1966). Modern Logic : an introduction . New York: Barnes & Noble.

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THOMAS, Norman L.. Modern Logic : an introduction. New York: Barnes & Noble, 1966. Text.

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THOMAS, Norman L.. Modern Logic : an introduction. New York: Barnes & Noble, 1966. Text.

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THOMAS, Norman L.. Modern Logic : an introduction. New York: Barnes & Noble, 1966. Print.