Library of Avalon Classification System

"The Library's classification system is unique, having been devised specifically for its purpose by the Founders (who based it upon the Bliss system), and formally copyrighted in 1990. It provides far more subcategories than would the Dewey decimal classification system. It is entirely alphabetical, the first two letters being the category code, the remaining three being the first three letters of the author's surname (with precedence rules for such names as macDonald, tenEyck or duMaurier).