Select Samples

Variable documentation on the website can be filtered to display only material corresponding to chosen datasets (more information on this feature).

1992
2001
2010
2009 1979
1998 1985
2009
1991
2005 2000 1995 1990 1985 1980 1975
2009 2002
2014 2005 2000 1995 1987 1983 1974
2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 1998 1995 1993 1985 1975 1965