Dan's answer: An antiquarian book is a book that is valued as a unique physical object. The value might derive from the edition, the quality of the printing, binding, or illustrations, the provenance, etc., but the book is not valued strictly as a vessel of the content inside.

Once a year, exhibitors from across the world convene at New York City's historic Park Avenue Armory, presenting a trove of materials including rare books, maps, illuminated manuscripts, fine bindings, illustrations, historical documents, photographs, prints, memorabilia, and ephemera.