|
|
Layer rock 
|
Map rock |
|
|
|
Worms on the surface of metal?
|
|
Chong Ho Yu, 2009 April |
|
|
|
Layer rock
|
Map rock |
|
|
|
Worms on the surface of metal?
|
|
Chong Ho Yu, 2009 April |
|
|
|
|
 |
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