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Radcliffe Tracts 21 (10)Ramsden, J.
Description and Method of Adjusting the improved Hadley's Sextant, made and sold by J. Ramsden, Mathematical, Optical, and Philosophical Instrument Maker, next St. James's Church, Piccadilly, London
n.p., n.d.
[1934-41]
[n.d.]