There are newsletters on every conceivable subject. Collectors and collectors' clubs publish newsletters about their interests. Specialist dealers publish them to interest and educate their customers. WP or desktop publishing software. The software that produces a newsletter can also produce a booklet.
Clubs can publish bylaws or membership rosters.
Specialists can publish booklets about the care of certain antiques or their history, value, or classification. Booklets can be sold or given away for goodwill. WP or desktop publishing software. Books about antiques are generally written by collectors or dealers. Whole markets have been influenced or even created by a timely book.