Elementary Trigonometry. By T. Roach. Oxford, Clarendon Pr. 12°

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  Elementary Trigonometry. By T. Roach. Oxford, Clarendon Pr. 12°

  Science14 Oct 1887 : 191

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  Elementary Trigonometry. By T. Roach. Oxford, Clarendon Pr. 12°

  Science14 Oct 1887 : 191

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