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Smith, David Eugene: Rara Arithmetica. Boston, 1908.
Snyder, Carl: The World Machine: The Cosmic Mechanism. London, 1907.
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Taylor, Henry Osborne: The Mediæval Mind.' 2nd edit. London, 1914.
Walsh, J. J.: Catholic Churchmen in Science. 2nd series. Philadelphia, 1909.
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II
Special Works.
