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| First Page | Document Content | |
|---|---|---|
 Date: 2006-10-11 11:00:14Geology of the United States Chalk Niobrara Formation Pierre Shale Archelon Plioplatecarpus Cretaceous Mosasaur |
| First Page | Document Content | |
|---|---|---|
Date: 2006-10-11 11:00:14Geology of the United States Chalk Niobrara Formation Pierre Shale Archelon Plioplatecarpus Cretaceous Mosasaur |
