Selecting “non-leisure” books

I try to always have a few unread books on my shelf, of both the leisure and “other” variety.

I’m currently reading a book in the leisure category, so my next should be of a different type.

Any suggestions on:

  1. Term for non-leisure books other than “other” or “non-leisure”?
  2. Criteria to use when selecting a non-leisure book to read?

Looking at my shelf, my unread options are:

And then there are the ones I read a lot of, but didn’t completely finish:

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