http://book.klll.cc/ebooks/subject/41607.opds 2025-09-05T02:00:38Z Books about Interstellar communication (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-09-05T02:00:38Z https://book.klll.cc/ebooks/76654.opds The new science of space speech Vincent H. Gaddis