[en] [Gutenberg 64325] • Landscape in History, and Other Essays Palala Press
[en] The origin · A biographical novel of Charles Darwin Doubleday
[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 2010] • The Autobiography of Charles Darwin W.W. Norton & Company