Account of the operations of the Great Trigonometrical Survey of India 7 General description of the principal triangulation of the north-east quadrilateral including the simultaneous reduction, and the details of five of the component series, the north-east longitudinal, the Budhon meridional, the Rangir meridional, the Amua meridional, the Karara meridional / prep. under the dir. of J. T. Walker
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Dehra Doon
1882
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