I just received my copy of William T. Vollmann's No Immediate Danger: Volume One of Carbon Ideologies and was pleasantly surprised to find one of my top-five favorite writers quoting another -- Gene Wolfe! It contains this epigraph:
"We all have in us the ghosts of long-vanished things, of fallen cities and marvelous machines. Gene Wolfe, 1982"
For ease of reference it is from The Sword of the Lictor, Chapter XXVI, Above the Jungle.
Vollmann has read widely in science fiction starting in the late 1960's and has cited James Blish's Cities In Flight as amongst his favorite books. Obviously, he has not idly consumed the Book of the New Sun as well.