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    Fergusson's percentage trigonometry or plane trigonometry reduced to simple arithmetic With a short description of his percentage compass

    Fergusson's percentage trigonometry or plane trigonometry reduced to simple arithmetic With a short description of his percentage compass gan Fergusson, John Coleman

    Cyhoeddwyd 1914
    Llyfr
    Ychwanegu at ffefrynnau
    Wedi'i Gadw mewn:

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