exceptional volume
A term used by the Library Binding Institute to
indicate types of books—such as music scores,
certain art books, periodicals with narrow binding
margins or stiff paper— which require good
openability. The Institute specifies that such
volumes should be sewn through the folds: when
such sewing is used, any weak folds are to be
reinforced with bond paper (which is too heavy for
this type of guarding): loose leaves are to be
hinged, and the sewing done on tapes or (sawn-in)
cords. The term applies only to library binding.
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