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HERSCHEL, Sir John Frederick William (1792-1871). Astronomer. Autograph Letter Signed to an unnamed correspondent, 1½ pages 8vo (a little worn, but professionally strengthened), endorsed by the recipient and dated by him ink 2 June 1827. Regretting that he would be unable to make the expedition to a cavern at Maidstone, and commenting on the observations being made at Camden Hill. [No: 0366] The image is of the first page only.
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