Ten Deadwood characters explain their real-life inspirations, how their characters differ from their RL counterparts, and, most interesting to me, the artistic choices about why those differences exist.
Although all the characters are, of course, part amalgamation and part outright invention, some noted multiple real-world inspirations. Some had a specific person in mind from the outset, while others developed the character and then discovered that a historical figure was similar to the character.
The library itself contains volumes of use to people roleplaying in the Black Hills of the Dakotas in the late 19th century, including sections on weapons, Chinese labor, and prostitution. (I averted my eyes from the latter, of course. :) ) The RP area of Deadwood has another, more period library, limited to books published before 1878. I wonder how they survive without books on the uses of cavorite, or building a ray gun?