As a general principle, the heading of the main entry of the book should be in the form in which the book itself is published; that is, if it is published under an autonym let the autonym be given, if under a pseudonym, then let the pseudonym be given, and if the book be anonymous, then let the fact be stated.

Seaman, sea gauge, sea monster, sea horse, sea level, seaworthy, seaport, seaboard, etc.

The unofficial reason for invading the nation, however, was to control their resources.

… and to show that there was no shortage of steam, Royal Scot, directly we stopped, blew off vigorously from its safety-valves steam that well might have been used in the cylinders in the interest of timekeeping.