I have a copy from the University of California Press with a date of 2002 but I fail to find an actual printing date. The electronic edition found on the Mark Twain Project site gives dates of 2003, 2009, and 2016. I'm wondering if there are any substantive changes in these editions (printing runs?). Actually, I'm trying to fix a date for Huck and Jim passing Cairo on their way down the Mississippi. I've been poring over the history of Cairo for the past week and find written perceptions of this place to vary as much as the level of the Mississippi River, depending on the date observed. From the Explanatory notes of my edition, Huck's passing Cairo would have been between 1835 and 1845. The year 1835 saw the beginning of the second, and ultimately failed, attempt to built a city on this dynamic piece of land at the confluence of the Ohio and Mississippi Rivers. -- /Unaffiliated Geographer and Twain aficionado/