I think ley-line magic -- whatever the spell that gets cast with ley-power -- always has an earth-magic component.

I don't think we've seen Harry use water spells, though.  Harry believes running water disperses magic; and so it does, for him.  Ramirez has strong aquamancy, I think, and he may not be as limited as Harry, in this regard.  Did we see Harry summon up water spirits?  Maybe when searching for Maggie?  Or in flashback of searching for Elaine (in the post-Justin timeframe)?

Harry's thaumaturgy skills. He has winter, so.....

Or a wordcount.
I think I remember hearing (reading) that the wordcount was already longer than any other DF novel, and still going...

Speaking from (probably shared) experience, the last fifteen minutes are spent staring at the clock, yelling at it for not going faster. I am also doing this to the calendar. You say it’s a bad idea, I say that I don’t care, I’m doing it anyway.