16.—Works of a marked classical character are not considered to require title entries, and seldom need subject-entries.
17.—Works of fiction with proper names in their titles call for consideration as to the best form of title-entry.
18.—When a book deals with a subject with a geographical limitation, choice between subject and geographical heading is sometimes necessary for the sake of economy. When in doubt give both entries.
19.—The above rule can be departed from in the case of the home country.
20.—The judicious abbreviation of entries is not so simple as it appears on the surface and requires care.
21.—Alphabetical arrangement is not by any means as simple as a b c.
22.—The use of repetition dashes should be strictly limited, and never exceed two under any circumstances.