I have a book on the F-16 fighter jet. Can I add a standard subdivision to show that this is a U.S. fighter aircraft?

Your book is about a single jet model made in the U.S. In this case, you stop at 623.7464 and do not add a standard subdivision to designate an area, because the F-16 does not approximate the whole of jets in the U.S. However, if you have a work about the collective fighter aircraft of a country, you do add the standard subdivision to designate that area because the work approximates the whole of aircraft for that country; for example, class a history of U.S. fighter jets at 623.74640973.

Last revised: 09 January 2004