MACK U SERIES 1976 (1) (RSS) 1977 (1) (RSS) 1978 (1) (RSS) 1979 (3) (RSS) 1980 (4) (RSS) 1981 (1) (RSS) 1982 (1) (RSS) 1983 (1) (RSS) 1984 (1) (RSS) 1987 (2) (RSS) 1988 (4) (RSS) 1989 (1) (RSS)