On their last day before they were to return to Hogwarts, Hermione wanted to check out the library one last time. There was a book on a high shelf that had captured her attention because she had seen the name "Nott" scribbled in gold letters along the binding. When she had  accioed  the text into her hands, she was right; Cantankerus Nott was the author of the  Pure-Blood Directory. It was published sometime around the 1930s.