TRIMMING
Binders should be instructed to trim as little as possible. This is important for all books, but most of all for periodicals. In fiction and juvenile books it is important to have wide margins, because the text will remain legible for a longer period of time if protected by a margin from the contact of hands. Non-fiction books which are likely to remain in use for a longer period of years may need to be rebound and trimmed again. Therefore wide margins are essential to good wear as well as to good appearance.
It is customary to bind front covers of periodicals. Sometimes it is desirable to bind advertising pages, and it is necessary to do so when the publishers follow the pernicious practice of continuing regular articles on advertising pages. Covers and advertising pages are generally printed with much narrower margins than the body of the magazine and unless great care is taken in trimming parts of the printed matter will be cut off.