http://www.gutenberg.org/ebooks/subject/5497.opds 2024-11-08T18:46:06Z Books about Matter (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 2024-11-08T18:46:06Z https://sendtokindle.compellingsciencefiction.com/ebooks/subject/5497.opds?sort_order=title Sort Alphabetically by Title 2024-11-08T18:46:06Z https://sendtokindle.compellingsciencefiction.com/ebooks/subject/5497.opds?sort_order=release_date Sort by Release Date 2024-11-08T18:46:06Z https://sendtokindle.compellingsciencefiction.com/ebooks/26839.opds Mathematical Recreations and Essays W. W. Rouse Ball 2024-11-08T18:46:06Z https://sendtokindle.compellingsciencefiction.com/ebooks/24667.opds Aether and Gravitation William George Hooper