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Books about Nebulae (sorted by popularity)
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https://sendtokindle.compellingsciencefiction.com/ebooks/36470.opds
Photographs of Nebulæ and Clusters, Made with the Crossley Reflector
James Edward Keeler
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https://sendtokindle.compellingsciencefiction.com/ebooks/68428.opds
Extra-galactic nebulae
Edwin Hubble
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https://sendtokindle.compellingsciencefiction.com/ebooks/71654.opds
Photographic investigations of faint nebulae
Edwin Hubble