Each researching character can attempt a Linguistics, Knowledge (history), or text-based Craft or Profession check (such as Profession [librarian] or Craft [bookbinding]) to find texts. You might use a different skill or ability, albeit with a penalty ranging from –2 to –5 at my discretion. Those who use magic or class abilities in a particularly creative or relevant way might receive up to a +5 bonus on a check, also at my discretion.