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| First Page | Document Content | |
|---|---|---|
 Date: 2009-10-21 14:45:26Chemical elements Noble metals Precious metals Transition metals Iridium Osmium Gubbio K–T boundary Walter Alvarez Geologic time scale Phanerozoic Cretaceous |
| First Page | Document Content | |
|---|---|---|
Date: 2009-10-21 14:45:26Chemical elements Noble metals Precious metals Transition metals Iridium Osmium Gubbio K–T boundary Walter Alvarez Geologic time scale Phanerozoic Cretaceous |
