http://www.gutenberg.org/ebooks/author/46445.opds
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Books by Metchnikoff, Elie (sorted by popularity)
Free eBooks since 1971.
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https://en.wikipedia.org/wiki/%C3%89lie_Metchnikoff
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https://sendtokindle.compellingsciencefiction.com/ebooks/51521.opds
The Prolongation of Life: Optimistic Studies
Elie Metchnikoff