Aberafan sample assessment for 1990-W26 Aberafan sample assessment for 1992-W33 Aberafan sample assessment for 1994-W25 Aberafan sample assessment for 1997-W35 Aberafan sample assessment for 1998-W30 Aberafan sample assessment for 2000-W22 Aberafan sample assessment for 2001-W22 Aberafan sample assessment for 2002-W27 Aberafan sample assessment for 2006-W20 Aberafan sample assessment for 2006-W30 Aberafan sample assessment for 2010-W26 Aberdyfi sample assessment for 1990-W32 Aberdyfi sample assessment for 1990-W38 Aberdyfi sample assessment for 1991-W30 Aberdyfi sample assessment for 1992-W22 Aberdyfi sample assessment for 1992-W31 Aberdyfi sample assessment for 1992-W33 Aberdyfi sample assessment for 1992-W35 Aberdyfi sample assessment for 1992-W37 Aberdyfi sample assessment for 1993-W21 Aberdyfi sample assessment for 1993-W32 Aberdyfi sample assessment for 1994-W37 Aberdyfi sample assessment for 1995-W29 Aberdyfi sample assessment for 1995-W34 Aberdyfi sample assessment for 1995-W36 25 1 0