Originally developed for the classification of materials held in the US Library of Congress, today the LCC is used to classify and arrange materials from academic libraries to virtual collections of Internet resources, such as the Scout Report Signpost. The LCC is maintained by the Cataloging Policy and Support Office of the Library of Congress. The 21 broad classes of LCC listed on the main page are further broken down by subclass for browsing. While not as easy to read as the tables in the "Unofficial Guide" to the Library of Congress Classification System (discussed in the September 13, 1996 Scout Report), the CPSO outline is the authoritative source for the LC Classification; it contains the latest additions and changes to the classification scheme.