13.9 DISCRETE ITEMS, STANDARD NUMBER AREA
13.9A. Preliminary rule
13.9A1. Scope.
See 1.9A1. Also consult the .9 rules in the chapters dealing with the broad classes of material relating to the intellectual form of the unit being described.
13.9A2. Punctuation
Precede this area by a full stop, space, dash, space or start a new paragraph.