13:15Byd Natur: Naturalists' Brains TrustBBC Home Service Mon 23rd Nov 1964, 13:15 on BBC Home Service Welsh Source: Radio Times
20:00Cysgod y Cryman: Shadow of the Sickle-serial play; 6t IBBC Home Service Mon 23rd Nov 1964, 20:00 on BBC Home Service Welsh Source: Radio Times