There are some serial publications which are difficult to locate as books or serials, such as monographic series, advances, progresses, proceedings, yearbooks and so on. This paper refers to these serial publications as the “Twilight Literature.” Lo ating them as serials, however, is a simple and practical way of managing the twilight literature, because they have more of the characteristics of serials than books. A reference screen enabling users to access them on the OPAC at Dokkyo University School of Medicine Library is presented.