Dr. Kilgour died at age 92 this week, and tributes to him are appearing here and there around Libraryland. (1)(2)(3). In his long career he never lost track of exactly what his purpose was: to make it possible for everyone to find the book they want, more or less right away, more or less every time.
Of course it's not possible. But 'Toward 100 Percent Availability' is an intention worth photocopying really large and hanging on the wall. Thank you, Dr. Kilgour. Frederick G. Kilgour, "Toward 100 Percent Availability," Library Journal 114 (Nov. 15, 1989).