However, the question of book labelling as part of a wider set
of issues in collection arrangement and book processing did not
attract much attention until 19th century when the size of library
collections created problems for the management and accessing of
books. Libraries that did not have a practice of labelling books had
to start introducing this method and librarians refusing to do so,
attracted criticism from their peers. Also the old mediaeval methods
of labelling books according to rooms, bookcases and shelves
(fixed book number) created problems in growing collections