I've read some excerpts on google books and I think it's just what I was looking for.

Dear and respected Master... I try to have any information to get a fac simile of the works of Ferdinando Valdambrini, but it seems that not many people has informations on these books. Rocky Mjos made some edition of several pieces, and the music seems very interesting (really first class!). I found that the originals are in Roma (San Cecilia ), but they don't answer when I ask for a copy or microfilm. Any suggestions?

Thank you for those informations. It's a pity that San Cecilia library doesn't answer my questions...An edition of this music will be for sure a success (if there are successes in baroque guitar edition!)