During Grad. School, I worked with Sousa historian Paul Bielrey for a few years. I was fortunate enough to take a trip out to the University of Illinois to visit the SABRE library (
http://lrs.ed.uiuc.edu/students/r-rosas/souscoll.htm). What an amazing source for band music. Not sure if it is a standard policy, or something Paul had worked out, but we had the freedom to handle any and all of the Sousa manuscripts in the library! Tons of Sousa autographs on the manuscripts. Unfortunately many were trimmed off when the library was looking for a way to store the music.
If you can post the pictures, that would be great.
Not sure when it will be available, but there will be a new book about the Sousa Band coming out shortly (not sure what shortly means exactly). This will be from Paul Bierley as well. My wife worked on the section that lists Sousa programs from his various tours. When it comes out, I will put a post up.
The US COast Guard Band will be doing a Sousa re-enactment conecrt in the next few months, Not sure when?