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A Logical Journey: From Gödel to Philosophy
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The 2nd Scientific American Book of Mathematical Puzzles & Diversions
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Historical dictionary of Leibniz's philosophy
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Historical dictionaries of religions. philosophies. and movements (66)
Principles of Mathematics. Second Edition
Carl Barnett Allendoerfer & Carl Barnett Allendoerfer (and Oakley (cletus Odia)) & Cletus Odia Oakley
Secrets of Yantra, Mantra and Tantra
L. R. Chawdhri