00291nam a2200109Ia 4500008004100000041000800041082000800049100003200057245003200089260005200121300000800173211209s1977    xx            000 0 und d  aeng  aINT  aINTERNATIONAL LABOUR OFFICE  aINTRODUCTION TO WORK STUDY   aGENEVAbINTERNATIONAL LABOUR ORGANIZATIONc1977  a456