1971 Surface 1971 Depth 1972 1973 1974 1975 Surface 1975 Depth 1976 1976 Depth 1977 Surface 1977 Depth 1990 1991 1992 1993
1971 Depth
1972
1973
1974
1975 Surface
1975 Depth
1976
1976 Depth
1977 Surface
1977 Depth
1990
1991
1992
1993
1971 1972 1973 1974 1975 1976 1977 1990 1991 1992 1993
1975
1977
2004 2005
2005
1971 1972 1973 1974 1975 1976 1977 1978 1979 1990 1991 1992 1993
1978
1979
1971 1972 1973 1974 1975 1976 1977 1990 1991 1992 1993 2002 2003
2002
2003
1971 1972 1973 1974 1975 1976 1977 1978 1979 1983 1984 1990 1991 1992 1993
1983
1984
1990 Fresh Water 1990 Plant Tissue 1991 Fresh Water 1991 Sediment Chemistry 1992 Fresh Water 1992 Sediment Chemistry 1993 Fresh Water 1993 Sediment Chemistry
1990 Plant Tissue
1991 Fresh Water
1991 Sediment Chemistry
1992 Fresh Water
1992 Sediment Chemistry
1993 Fresh Water
1993 Sediment Chemistry
1973 1974 1975 1976 1977 1978 1980 1981 1982 1983 1984 1985 1990 1991 1992 1993
1980
1981
1982
1985
1973 1974 1981
1971 1972 1973 1974 1975 1976 1977 1978 1980 1981 1982 1990 1991 1992 1993
1988 1989 1990
1989
1975 1976
1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1990 1991 1992 1993 2002
1972 1973 1974 1975 1976 1977 1978 1980 1981 1982 1984 1990 1991 1992 1993 2002
1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1984 1990 1991 1992 1993 2002
1991 Fresh Water 1991 Sediment Chemistry 1992 Fresh Water 1992 Sediment Chemistry 1993 Animal Tissue 1993 Fresh Water 1993 Sediment Chemistry
1993 Animal Tissue
1990 1991 1992 1993 2001
2001
2002 2003 2004
2004
1990 1991 1992 1993 2002
2002 2003 2004 2005
1975 1976 1990 1991 1992 1993 2002
1971 1972 1973 1974 Surface 1974 Depth 1975 Surface 1975 Depth 1976 1977 Surface 1977 Depth 1990 Fresh Water 1991 Fresh Water 1992 Fresh Water 1993 Fresh Water
1974 Surface
1974 Depth
1990 Fresh Water
1990 Fresh Water 1990 Plant Tissue
1991 1992 1993
1988 1989 1992 1993 2001
1986 2002
1970 1971 1972 1973 1974 1975 1976 1977 1978 1980 1981 1982 1983 1984 1990 1991 1992 1993
1971
