http://www.gutenberg.org/ebooks/subject/9097.opds 2024-11-14T06:21:46Z Books about Astronomy -- Observers' manuals (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://www.gutenberg.org webmaster@gutenberg.org https://www.gutenberg.org/gutenberg/favicon.ico 25 1 2024-11-14T06:21:46Z https://sendtokindle.compellingsciencefiction.com/ebooks/subject/9097.opds?sort_order=title Sort Alphabetically by Title 2024-11-14T06:21:46Z https://sendtokindle.compellingsciencefiction.com/ebooks/subject/9097.opds?sort_order=release_date Sort by Release Date 2024-11-14T06:21:46Z https://sendtokindle.compellingsciencefiction.com/ebooks/28752.opds Pleasures of the telescope Garrett Putman Serviss 2024-11-14T06:21:46Z https://sendtokindle.compellingsciencefiction.com/ebooks/57320.opds Telescopic Work for Starlight Evenings William F. Denning