I have a folder which looks like this, full of 500 Scarlatti sonatas and 45 supplemental sonatas:

And here's the beginning of the first file:

And the beginning of the first supplemental sonata file:

For submission to IMSLP, I need to check it's public domain, but I cannot figure out which edition this is - the only comparably complete edition I can find is the Ricordi, and I can't get a picture of a page from that to both see if they match visually and check the copyright date. Any help would be appreciated, because I think this would be a nice addition to the library.