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Deep-sky object
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==Further reading== * ''Burnham's Celestial Handbook'' by [[Robert Burnham, Jr.]] ([https://books.google.com/books?id=T8wO7M8QrmEC Volume One], [https://books.google.com/books?id=wB9uZ9lH5bgC Volume Two], [https://books.google.com/books?id=PJzIt3SIlkUC Volume Three] at Google Books) * ''Deep Sky Observer's Guide'' by Neil Bone, Wil Tirion. Firefly Books, 2005. {{ISBN|1-55407-024-4}}. * ''The practical astronomer's deep-sky companion'' by Jess K. Gilmour. Springer, 2003. {{ISBN|1-85233-474-6}}. * ''Concise Catalog of Deep-sky Objects: Astrophysical Information for 500 Galaxies, Clusters and Nebulae'' by W. H. Finlay. London: Springer, 2003. {{ISBN|1-85233-691-9}}. Includes the Messier objects, Herschel 400 & more * ''Visual astronomy of the deep sky'' by Roger Nelson Clark. CUP Archive, 1990. {{ISBN|0-521-36155-9}}.
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