I am in search of scans of the original parts, scores, etc of the four big works that are from the 18th century featuring the trombone as solo instrument. I have one of the two sets of parts for the Wagenseil already, but want both. For the Haydn and Mozart, I'd prefer the entire work, and not just the movements with trombone.

To be clear, I am not trying to get parts that are protected by copyright -- ie modern editions. I want public domain scans of the source material. I'd say it was long shot, but I know of at least two members who have some or all of these works in the format I'm asking for, and they've said that they would not give it up for anything.

I'd be willing to pay! Thanks!