Indeed, some of the early history of Prolog is in Hewitt's PLANNER: https://en.wikipedia.org/wiki/Planner_(programming_language)#The_genesis_of_Prolog https://

Indeed, some of the early history of Prolog is in Hewitt's PLANNER: https://en.wikipedia.org/wiki/Planner_(programming_language)#The_genesis_of_Prolog https://en.wikipedia.org/wiki/Planner_(programming_language)... .