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Radcliffe Tracts 39 (4)Dunn, Samuel
A Determination of the exact Moments of Time when the Planet Venus was at external and internal contact with the Sun's Limb, in the Transits of June 6th, 1761; and June 3d, 1769
As read before the Royal Society at London, February 22d 1770, and printed in their Transactions, 1770. London: Printed by W. Bowyer and J. Nichols, 1770.