REFERENCE BOOKS
Reference books should be bound in the same way as fiction or juvenile books, except that morocco, instead of cowhide, should be used for books constantly handled. Books used only occasionally should be covered with cloth made according to the Specifications of the Bureau of Standards. Very heavy, thick volumes, such as dictionaries, should have all the strengthening devices and especially should have the bands and canton flannel on the back placed in split boards or between two boards glued together. It is impossible to bind such books too strongly. In rare cases it may be well to sew heavy books constantly used on raised bands, to have leather corners, and a strip of leather along the bottom of each board.