Account of the Observations and Calculations: Of the Principal Triangulation; and of the Figure, Dimensions and Mean Specific Gravity of the Earth as Derived Therefrom

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G.E. Eyre and W. Spottiswoode, 1858 - Earth - 782 pages
Results of a survey project carried out between 1783 and 1853 at the instigation of the Director of the Ordnance Survey General William Roy, to accurately measure the dimensions of Great Britain and Ireland, for mapping and for levying land taxes.
 

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