If you have access to the Bone Market and can reach Respectable 15 (easier than the other two high-end buyers), you can grind Memories of Light, convert them into Zee-Ztories and upconvert into Partial Maps. That has to be better than Educating Lyme in terms of EPA, and it’s a quite convenient way to assemble large numbers of Partial Maps needed e.g. for Jericho Canals.