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PPMS 31/File 74 1956: Triad Contains documents on secret societies' marriage initiation ceremony and Chioh Thow (Combing of the
PPMS 31/File 61, undated: Secret Societies, Who Kei Contains reports stating Wah Keiýs activities and operation bases in different Malayan towns and
PPMS 31/File 75, 1957-1964: Triad Societies Contains a lecture note on secret societies in Malaya. It highlights their background, initiation
PPMS 31/File 63-66, 1949 and 1956: Rituals Contains reports on initiation ceremony of secret societies, their secret hand signs, certificate or
PPMS 31/File 98, 1957: Red Documents Contains translation listing of documents translated for the Malacca Magistrateýs Court Arrest Case
