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Books about Astronomy -- Observers' manuals (sorted by popularity)
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https://sendtokindle.compellingsciencefiction.com/ebooks/28752.opds
Pleasures of the telescope
Garrett Putman Serviss
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https://sendtokindle.compellingsciencefiction.com/ebooks/57320.opds
Telescopic Work for Starlight Evenings
William F. Denning