International Metalworkers' Federation. Congress

• 20. Internationaler Metallarbeiterkongress
• Minutes of the Eighteenth Congress of the International Metalworkers' Federation, held in Lugano, Switzerland from 17 to 21 September 1957
• Minutes of the twenty-second Congress of the International Metalworkers' Federation, Palais de Beaulieu, Lausanne, from 26 to 30 October, 1971
• Proceedings of the twenty-third Congress, International Metalworkers' Federation, Parliament Building, Stockholm, 2 to 6 July, 1974