1971a 1971b 1971c 1972a 1972b 1972c 1972d 1973a 1973b 1974a 1976a 1977a 1977b 1977c 1977d 1979a 1980a 1980b 1981a 1981b 1981c 1982a 1982b 1982c 1982d 1982e 1983a 1983b 1983c 1983d 1984a 1984b 1984c 1984d 1984e 1984f 1984g 1984h