London: Davis & Reymers, 1756. Simpson, Thomas (1710-61). A letter to the Right Honourable George Earl of Macclesfield, President of the Royal Society, on the advantage of taking the mean of a number of observations, in practical astronomy. In Philosophical Transactions 49 (1755): 82-93. Whole volume, 4to. , 444pp. Folding.....
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