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Potentiometric Surface Data for 1975 (0)
Potentiometric Surface Data for 1978 (1)
Potentiometric Surface Data for 1979 (2)
Potentiometric Surface Data for 1980 (3)
Potentiometric Surface Data for 1981 (4)
Potentiometric Surface Data for 1982 (5)
Potentiometric Surface Data for 1983 (6)
Potentiometric Surface Data for 1984 (7)
Potentiometric Surface Data for 1985 (8)
Potentiometric Surface Data for 1986 (9)
Potentiometric Surface Data for 1987 (10)
Potentiometric Surface Data for 1988 (11)
Potentiometric Surface Data for 1989 (12)
Potentiometric Surface Data for 1990 (13)
Potentiometric Surface Data for 1991 (14)
Potentiometric Surface Data for 1992 (15)
Potentiometric Surface Data for 1993 (16)
Potentiometric Surface Data for 1994 (17)
Potentiometric Surface Data for 1995 (18)
Potentiometric Surface Data for 1996 (19)
Potentiometric Surface Data for 1997 (20)
Potentiometric Surface Data for 1998 (21)
Potentiometric Surface Data for 1999 (22)
Potentiometric Surface Data for 2000 (23)
Potentiometric Surface Data for 2001 (24)
Potentiometric Surface Data for 2002 (25)
Potentiometric Surface Data for 2003 (26)
Potentiometric Surface Data for 2004 (27)
Potentiometric Surface Data for 2005 (28)
Potentiometric Surface Data for 2006 (29)
Potentiometric Surface Data for 2007 (30)
Potentiometric Surface Data for 2008 (31)
Potentiometric Surface Data for 2009 (32)
Potentiometric Surface Data for 2010 (33)
Potentiometric Surface Data for 2011 (34)
Potentiometric Surface Data prior to development (35)
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