Also in relation to Walt Stuart...
...I am part of a consortium that purchased the entire Walt Stuart library back a year or so ago. I was the member with the convenient trailer and enough spare time to spend a week at Disney World, taking a Saturday in the midst of it all to pick up the library.
The collection filled about sixty boxes to the brim, with everything from the original arrangement copies (many on onionskins) to intact copies of arrangements that Walt sold commercially, to his arranging tools and reference library. Getting it all packed up required the assistance of my n'er-do-well brother, my daughter (both resident in Central Florida), Mr. Bertini and my lovely wife for a full five hours (including a comprehensive cleanup of the room at his sister's condominium that he used for his studio).
Email me for a referral to the head of the consortium should you be interested in any of Walt's creations.