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Photographs of Nebulæ and Clusters, Made with the Crossley Reflector

James Edward Keeler

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Photographs of Nebulæ and Clusters, Made with the Crossley Reflector

James Edward Keeler

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On the Construction of a Silvered Glass Telescope Fifteen and a half inches in aperture, and its use in celestial photography

Henry Draper

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On the Construction of a Silvered Glass Telescope Fifteen and a half inches in aperture, and its use in celestial photography

Henry Draper

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