The third book is the #Weirdstone of Brisingamen by #AlanGarner which I have never read (though I listened to the #BBC #audio dramatisation once). Although published in 1960, this book didn't make it onto #Gygax 's list in #AppendixN . I'm not sure of the reason for this omission, the book was certainly known in USA (In 1970 it was given an award by the University of Wisconsin-Madison School of Education).