Have you checked Libgen sorted by year[0]. There are several Prolog books from the 80s. Maybe the one you looking for is there.
[0]http://libgen.is/search.php?&req=Prolog&phrase=1&view=simple...
[0]http://libgen.is/search.php?&req=Prolog&phrase=1&view=simple...
But I did come across this gem which I'm browsing now lol: "Prolog Versus You: An Introduction to Logic Programming"