Petrograph
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Link to all Petrographs

2010 and newer Petrographs
2000 - 2009 Petrographs
1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 | 1990
1980 - 1989 Petrographs
1970 - 1979 Petrographs
1960 - 1969 Petrographs
1957 - 1959 Petrographs
Petrograph Evolution video

1999



January


February

March

April

May

June and July
 
August and September

October

November

December

1998



January


February

March

April

May

June and July
 
August and September

October

November

December

1997



January


February

March

April

May

June
 
September

October

November

December

1996



January


February

March

April

May

June
 
September

October

November

December

1995



January


February

March

April

May

June
 
September

October

November

December

1994



January


February

March

April

May

June
 
September

October

November

December

1993



January


February

March

April

May

June
 
September

October

November

December

1992



January


February

March

April

May

June

July
 
September

October

November

December

1991



January


February

March

April

May

June
 
September

October

November

December

1990



January


February

March

April

May

June
 
September

October

November

December

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