I'm behind on scanning and photographing jacket covers and making CD inserts, so I am posting the link to the main Op. 20 folder without anything except the music files, in order to make the performances available without accessory material.
The post will be revised, and all the other goodies included at some point, including a consideration of where Op. 20 stands in Haydn's output. In the meantime, download and enjoy the music and these great performances: