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Forbes, Eric G. (1975). Greenwich Observatory, volume 1: Origins and Early History (1675–1835). London: Taylor & Francis. p. 176. Bibcode:1975gosb.book.....F.
Forbes, Eric G. (1975). Greenwich Observatory, volume 1: Origins and Early History (1675–1835). London: Taylor & Francis. p. 175. Bibcode:1975gosb.book.....F.