Pudd'nhead wilson

Book info needed!
Recently discovered original book by Mark Twain but the title dosen't match others.
The title of my book:Pudd'nhead Wilson and Those Extraordinary Twins. This book also seems to have an original signature in the front.
The title of what everyone else lists: The Tragedy of Pudd'nhead Wilson.
Help! Chacho

http://www.powells.com/biblio?isbn=0393950271

Any help?
queenbu

The book was originally published in America, on 28 November 1894, as The Tragedy of Pudd'nhead Wilson and the Comedy of Those Extraordinary Twins.