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p001j <br />O <br />1946 <br />1948 <br />1950 <br />1952 <br />1954 <br />1956 <br />1958 <br />1960 <br />1962 <br />1964 <br />1966 <br />m 1968 <br />D 1970 <br />1972 <br />1974 <br />1976 <br />1978 <br />1980 <br />1982 <br />1984 <br />1986 <br />1988 <br />1990 <br />1992 <br />? jjr?C, j <br />NUMBER OF MONTHS IN WHICH <br />ICE COVER WAS REPORTED <br />-l N w .4, to <br />t <br />1 <br />O <br />n? N M <br />?G m <br />? Q <br />C <br />v rC+ <br />3 C <br />r+ <br />n? <br />