I have started mapping significant Mark Twain locations from his book Roughing It. The first chapter is merely a dismal riverboat ride from St. Louis to St. Joseph Missouri. I made my first attempt at animated mapping in the video for that chapter. But Chapter 2 has Sam traveling the Overland Stagecoach line out of St. Joseph, across Kansas.  He does not mention any stations by name but does say they stop every ten miles or so. My Googling around for information on these stations led to listings of the Pony Express Stations. I decided to use the information provided by the National Park Service (http://www.nps.gov/parkhistory/online_books/poex/hrs/hrst.htm). I have tried to determine exact geographical coordinates but I'm not entirely satisfied with the results, so if anyone has more precise locations for these stations please let me know so that I can update my map. 

The only stop that Mark Twain mentions by name is Cottonwood. This is the stop the Sphinx suggested they lay over a couple of days. This station is also known as Hollenbeck