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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />c <br />a~ <br />c <br />a~ <br />-~ <br />-~ <br />a~ <br />O <br />a~ <br />U <br />Year November December January February March <br />1946 <br /> <br />1947 <br /> <br />1948 <br /> <br />1949 <br /> <br />1950 <br /> <br />1951 <br /> <br />1952 <br /> <br />1953 ? <br />1954 <br /> <br />1955 <br /> <br />1956 <br /> <br />1957 <br /> <br />1958 <br /> <br />1959 <br /> <br />1960 <br /> <br />1961 <br />1962 ? <br />1963 <br /> <br />1964 <br />1965 <br />1966 I---- ? <br />1967 ? <br />1968 <br />1969 <br />1970 <br />1971 f-- ? <br />1972 f -- ? <br />1973 ? <br />1974 f -- ? <br />1975 <br />1976 <br />1977 ? <br />1978 <br />1979 <br />1980 <br />1981 <br />1982 <br />1983 <br />1984 . <br />1985 I-- ? <br />1986 ? <br />1987 <br />1988 <br />1989 <br /> <br />1990 <br /> <br />1991 <br />1992 <br />Figure 8. Sl~ary of USGS ice observations <br />SD-72 <br />