THOMAS UNSPECIFIED 1973 (1) (RSS) 1974 (1) (RSS) 1975 (1) (RSS) 1978 (1) (RSS) 1979 (2) (RSS) 1980 (6) (RSS) 1981 (6) (RSS) 1982 (7) (RSS) 1983 (7) (RSS) 1984 (7) (RSS) 1985 (7) (RSS) 1986 (4) (RSS) 1987 (3) (RSS) 1988 (2) (RSS)