Abstract
This article analyzes the Rare Book and Special Collections from a theoretical point of view. During its development, the following facets or theoretical dimensions are settled down: linguistic or terminological facet, temporary-space facet, documentary facet, geographic facet, economic facet, political facet, social facet, professional or technical facet, facet of the History of the book, of the libraries and of reading, patrimonial facet and facet of the “paradoxical dispersion”. Some of the conclusions of the paper are focused in the complexity to define the Rare Book, because it is characterized by its multiplicity of accesses and its multidisciplinary rhetoric.
