The document discusses the history and development of library catalogue codes from early stages to modern times. It traces the evolution from primitive catalogues in clay tablets and papyrus rolls used by ancient civilizations to more systematic finding lists and catalogues developed during medieval times in monastic libraries. The modern era saw proliferation of catalogue codes in the 19th century with standardization efforts including development of subject heading lists and classification schemes. Key codes discussed include the British Museum Cataloguing Rules formulated by Panizzi in 1841, which were influential but intended for use in a single large library.