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These were known autographed editions that were part of a subscription service
where the customer would get to choose their preference of bindings and would receive
a new volume of the Autograph Edition that had drawings and special inserts on occasion.
These were offered to only the wealthiest book collectors of the time. The average price for the set of 22 volumes
was $200 at the time which would be about $7500 today based on infation.
This book that you have (without seeing it) has a current value of $3200 to $4500 (the range is for condition).
You can read more about some of the other editions that were offered here. http://www.twainquotes.com/UniformEds/UniformEdsCh4-a.html
TO sell, you might want to try consigning to an auction house. http://www.sothebys.com/en/departments/books-manuscripts.html
You can also go to liveauctioneers.com and invaluable.com to search their directory to find an auction house that deals in books.
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