http://book.klll.cc/ebooks/subject/12567.opds 2025-11-16T13:02:02Z Books about Astronautics and civilization Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-16T13:02:02Z https://book.klll.cc/ebooks/19911.opds The Practical Values of Space Exploration United States. Congress. House. Committee on Science and Astronautics.