Twain's newly "rediscovered" article about the hanging in Nevada
has been online in Barbara Schmidt's collection of Twain's early
journalism for more than a year now.  All of the Chicago Republican
articles are online at:

Mark Twain in the Chicago Republican
http://www.tarleton.edu/~schmidt/crindex.html

The specific article about the hanging is at:

Letter from Mark Twain
http://www.tarleton.edu/~schmidt/18680531.html

Jim Zwick