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Deep-sky object
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==References== <references/> * Neil Bone, Wil Tirion, ''Deep Sky Observer's Guide''. Firefly Books, 2005. {{ISBN|1-55407-024-4}}. * Jess K. Gilmour, ''The practical astronomer's deep-sky companion''. Springer, 2003. {{ISBN|1-85233-474-6}}. * Jack Newton, Philip Teece. ''The Guide to Amateur Astronomy''. Cambridge University Press, 1995. {{ISBN|0-521-44492-6}}. * W. H. Finlay, ''Concise Catalog of Deep-sky Objects: Astrophysical Information for 500 Galaxies, Clusters and Nebulae''. London: Springer, 2003. {{ISBN|1-85233-691-9}}. Includes the Messier objects, Herschel 400 & more. * Roger Nelson Clark, ''Visual astronomy of the deep sky''. CUP Archive, 1990. {{ISBN|0-521-36155-9}}.
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