This paper reports on and discusses five different topics in the field copying for preservation : 1) How the selection of books in poor condition that must be repaired or replaced or photocopied is managed in Yale. 2) A Yale completion and reproduction program for books that are not available commercially. 3) What criteria are considered and followed at Yale to provide copies that can serve as substitutes for originals. 4) A survey of US commercial book copying firms. 5) Advantages and disadvantages of photocopy and microform.