Different kind of scam. Those books are fillable forms -- the medical titles have pages of generic questions like "how often should I take <some medication>" and "can you take <some medication> with food", with large spaces for the reader to write an answer. The books aren't specific to the medication at all, as evidenced by the fact that they're full of irrelevant questions (like asking if an antiparasitic drug is addictive).

The business titles in the second SERP look similar -- they're poorly formatted scoring systems or checklists.

So yeah. Those books look "legitimate" inasmuch as they are at least intended to be bought by real people believing that they are useful, rather than as a means of money laundering. The content of the books is heavily templated to the point of making the books not worth their selling price, but that's a separate issue.