My favorite is the first edition on display at http://www.archive.org/details/adventuresoftoms00twaiiala from Internet Archive
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From: Mark Twain Forum [mailto:[log in to unmask]] On Behalf Of Joseph Csicsila
Sent: Thursday, March 22, 2012 3:30 PM
To: [log in to unmask]
Subject: Online Tom Sawyer Resource(s)?
Wondering if anyone knows of any good online resources for someone teaching TOM SAWYER for the first time.