I've also had trouble with this and find that most of them drop from mobs that are this level. It seems like every time I'm looking for pages they drop in the next zone I would be travelling to level.
A more clear example would be that I found my level 24 page drops in Warsliks Woods giant fort when I needed it while Xp'ing in LOIO. I found my 29 words in Frontier Mountains when I was XP'ing in Warsliks Woods. They appear to be found more often on mobs that are closer to the spell level (while we typically fight things 3-4 levels below us for XP).
Hope that helps.
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