This document discusses the classified catalogue and its various components according to Ranganathan's principles. It describes the main entry which includes sections like the leading section, heading section, title section, note section and accession number section. It also discusses the various added entries like cross reference entries, class index entries, book index entries, series index entries and cross reference index entries. These added entries are derived from the main entry to satisfy different reader needs. The classified catalogue has two parts - the classified part containing numeric entries and the alphabetical part containing word entries.