Newman, F. William. (1841). The difficulties of elementary geometry: especially those which concern the straight line, the plane, and the theory of parallels. London: W. Ball and co..MLA Citation
Newman, Francis William, 1805-1897. The Difficulties of Elementary Geometry: Especially Those Which Concern the Straight Line, the Plane, And the Theory of Parallels. London: W. Ball and co., 1841.
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