[simongray]

I did some further research and it seems like The Art of Prolog gets the most love even though it's from the mid-nineties - and still hella expensive like you say!

The only thing I'm wondering about are skipping any important developments made in the last 25 years, but I guess I can always jump into the more up-to-date online resources by then.

[i_don_t_know]

The Art of Prolog is available as a free download (PDF) on the MIT Press website under „Open Access“.

AFAIK the biggest item that’s missing is constraint logic programming. Markus Triska discusses CLP in his Power of Prolog book.

[simongray]

Thank you for pointing that out.