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Books about Haeckel, Ernst, 1834-1919 (sorted by popularity)
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https://sendtokindle.compellingsciencefiction.com/ebooks/70451.opds
Haeckel : his life and work
Wilhelm Bölsche
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https://sendtokindle.compellingsciencefiction.com/ebooks/48180.opds
Major Prophets of To-Day
Edwin E. Slosson