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| First Page | Document Content | |
|---|---|---|
 Date: 2008-08-31 00:16:04Solar cycle Sunspot Sun Solar minimum Solar variation Solar cycle 21 Astronomy Physics Matter |
| First Page | Document Content | |
|---|---|---|
Date: 2008-08-31 00:16:04Solar cycle Sunspot Sun Solar minimum Solar variation Solar cycle 21 Astronomy Physics Matter |
