Philosophy professor John Kaag’s 2016 book, American Philosophy, was a heady mix of memoir and intellectual history wrapped up in a romantic story of a lost library and new love. In Hiking with Nietzs. Socialists, naturists, militarists, pagans and the Nazis have all valued camping, hiking, woodcraft and the outdoor lifestyle at one time or another. Camping books. “Autumn Imago” is an apt title for this book because nature and…