This page lists all the Πάπυροι found in the The Witcher with links to the individual pages. Scrolls are not the only reading material available to Γκέραλτ. There are also many books and posters scattered around Vizima and environs.
Potion and oil scrolls
Single formula scrolls
Scrolls for Μεταλλαξιογόνα Φίλτρα
While these potions are called mutagenic, they do not require the "mutagen" ingredient (it can of course be used if hydragenum is necessary, but it has no special purpose or effect), contrary to what some players have assumed. They actually produce the "mutagen" referred to on the hero panel to unlock certain abilities like Rising Moon or Predator.
This list shows who sells them in the "vendor(s)" column and where they are available for free (if indeed they are) in the "freebies" column. Other scroll lists include: