The University of Nairobi Library System is composed of twelve libraries grouped into six college libraries plus a central library. The central library known as Jomo Kenyatta Memorial Library (JKML) also houses the administration, central services such as acquisitions, cataloguing co-ordinating unit, the union catalogues, the bindery and the archives. The system has a total stock of approximately half a million volumes, inclusive of books, periodicals and other non-print materials. The stock is divided into a general lending materials ands specialised research collections. Books in the library system are classified by the Library of Congress Classification Scheme. A union catalogue of library materials held in the system is maintained in the JKML. Sub-libraries have catalogues of their own holdings.