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Astronomical Observations for Latitude Made During the Period 1885 to 1905 and the Deduced Values of the Deflections of the Plumb-line
Survey of India. Trigonometrical Branch
出版Printed at the office of the Trigonometrical survey of India, 1906
URLhttp://books.google.com.hk/books?id=qvIfAQAAMAAJ&hl=&source=gbs_api