December 29, 1884 Cumberland Presbyterian Church. Unable to find location.  

Interviewed: "Mark Twain Gets Shaved", Pittsburgh Penny Press, 29 December 1884, p4  In "Mark Twain: The Complete Interviews" (#27) 

Monongahela House  "Talk with Twain" Pittsburgh Chronicle, 29 December 1884, p1. (#28)  Mentions that the location of the church is on Sixth avenue.