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    https://books.google.de/books?id=85RZ04fHe88C&pg=PA224&lpg=PA224&source=bl#v=onepage&q&f=true

    any popular books upon astronomy have been written during the Mpast few years, but most of them cater either for the casual dabbler who is content to learn from the depths of his armchair or else for the serious amateur who already knows the main…



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