Here is a description of a truly excellent online resource that I'm sure
many will want to explore.  The description is from the page itself:
 
Mark Twain's Huckleberry Finn: Text, Illustrations, and Early Reviews
by Virginia H. Cope, University of Virginia
 
This collection offers a complete early edition of Huckleberry Finn,
the 174 illustrations from the first edition, and the obscene illustration
that appeared in the sales prospectuses. Also included: dozens of early
reviews from newspapers and magazines across the country; early ads;
the London and American first edition covers; and a 1930 article by
E.W. Kemble describing his experiences illustrating Huckleberry Finn.
 
URL: http://viva.lib.virginia.edu/etext/twain/huckfinn.html
 
Jim Zwick
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http://web.syr.edu/~fjzwick/