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An account of the trigonometrical operation, wherby the distance between the meridians of the observatories of Greenwich and Paris has been determined / By William Roy.

The military antiquities of the Romans in Britain / By the late William Roy ... Published by the order, and at the expence of, the Society of Antiquaries of London.

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Roy, William, 1726-1790

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An account of the trigonometrical operation, wherby the distance between the meridians of the observatories of Greenwich and Paris has been determined / By William Roy.

The military antiquities of the Romans in Britain / By the late William Roy ... Published by the order, and at the expence of, the Society of Antiquaries of London.