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There'a a couple of old books that I've found to be quite useful for getting ideas on double stars by constellation. Pleasures of the telescope, celestial objects for common telescopes, half hours with the telescope. Fun to read and nice descriptions. Sissy Haas is a goldmine - pencilling in the SAO numbers to make things easier next time, Norton's is also useful for making up short lists of nice doubles in a particular area of the sky. I stopped off at 145CMa on the way to Beta Mon last night and was struck by how similar the colours were to Gamma Volantis, well to my eyes at least.
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