[sajb]

This seems to have a simple solution - if you can't find any reference to a particular book by googling its title, then it likely does not exist.

[nephihaha]

You have too much faith in Commissar Google. I know of numerous books which don't appear on Google. Likely the tip of the iceberg.

[Krasnol]

The problem is that this solution runs counter to what is expected from AI customers today: subscribe and turn off your brain.

(Yes, I know about the phrases written below every singe one of them. They're probably being taken just as seriously as ToS.)

[wakawaka28]

It depends on the title. Many titles are difficult to search for.