http://book.klll.cc/ebooks/author/53893.opds?sort_order=release_date 2025-11-18T09:40:58Z Books by Menzel, Donald H. (Donald Howard) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-18T09:40:58Z https://en.wikipedia.org/wiki/Donald_Howard_Menzel See also: en.wikipedia 2025-11-18T09:40:58Z https://book.klll.cc/ebooks/66639.opds The World of Flying Saucers: A Scientific Examination of a Major Myth of the Space Age Donald H. Menzel and Lyle Gifford Boyd