There is a large web site edited by Donald Forsdyke containing
selected papers and commentary on various aspects of evolution, both
current and historical at
http://post.queensu.ca/~forsdyke/evolutio.htm

I am told that the site will in due course also contain the entire
Darwin correspondence which is being published by Cambridge
University Press (11 vols. published).
Robert Maxwell Young
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http://www.human-nature.com