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Link to all Petrographs

2010 and newer Petrographs
2000 - 2009 Petrographs
1990 - 1999 Petrographs
1980 - 1989 Petrographs
1970 - 1979 Petrographs
1960 - 1969 Petrographs
1959 | 1958 | 1957
Petrograph Evolution video

1959

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April

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1958

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May

1957

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March

 

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