1. In a microfilm printer apparatus that includes means for storing signals corresponding to a selectable first variable number of prints to be made of each of a second variable number of image frames on a microfilm; means, in response to a print signal, for automatically producing collated sets of said number of prints of each of said number of image frames; and characterized by means for automatically distinguishing between chapters of image frames on said microfilm and, in response to said print signal, printing only the selected number of prints of a variable number of image frames in a chapter.