This is the only safe bet. Go to IMSLP.org and search "Seidler." If a high-quality scan exists, it is here. Look for the file with the highest MB size (bigger usually means better resolution).
Scalic passages, arpeggios, and turns designed to make the voice flexible and responsive. seidler larte del cantare pdf download extra quality
: In the digital domain, "extra quality" often refers to high-fidelity PDF scans of original historical editions, sometimes including piano accompaniment tracks (karaoke style) to assist solo practice. This is the only safe bet