Appropriate historical or sympathetic bindings are also designed, as well as sound, functional structures. Each treatment recommendation is written after close examination of the individual book with considerations of its history and its current role. Upon request, historical structures can be constructed, including Nag Hammadi (Fourth Century Christian), Ethiopian, Coptic, and from the European traditions, bindings utilizing alum tawed, limp vellum, calf, goat, paper and cloth, with historic style sewing and endband structures, as appropriate. Preserving original components of historic bookbindings with appropriate and subtle techniques are emphasized.