http://www.gutenberg.org/ebooks/author/52228.opds
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Books by Hubbard, Gardiner G. (Gardiner Greene) (sorted by popularity)
Free eBooks since 1971.
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https://en.wikipedia.org/wiki/Gardiner_Greene_Hubbard
See also: en.wikipedia
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https://sendtokindle.compellingsciencefiction.com/ebooks/63012.opds
South America
Gardiner G. Hubbard