[en] [Gutenberg 6919] • Darwiniana : Essays — Volume 02 Dutt Press
[en] [Gutenberg 5273] • Darwiniana; Essays and Reviews Pertaining to Darwinism University of Michigan Library
[it] [Gutenberg 45296] • Carlo Darwin Forgotten Books
[en] [Gutenberg 34006] • Rustic Sounds, and Other Studies in Literature and Natural History Createspace Independent Publishing Platform
[en] [Gutenberg 2010] • The Autobiography of Charles Darwin W.W. Norton & Company