http://www.gutenberg.org/ebooks/author/53893.opds
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Books by Menzel, Donald H. (Donald Howard) (sorted by popularity)
Free eBooks since 1971.
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https://en.wikipedia.org/wiki/Donald_Howard_Menzel
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2024-11-06T12:32:40Z
https://sendtokindle.compellingsciencefiction.com/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