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Areas of Importance
Ring-Billed Gull (RBGU)
19c Howard Slough
| Year | Mean | Peak | % of GSL Mean |
| 1997 | 10.0 | 90 | 0% |
| 1998 | 259.1 | 1350 | 4% |
| 1999 | 99.9 | 471 | 3% |
| 2000 | 114.3 | 629 | 2% |
| 2001 | 137.1 | 1170 | 4% |
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| Year | Mean | Peak | % of GSL Mean |
| 1997 | 10.0 | 90 | 0% |
| 1998 | 259.1 | 1350 | 4% |
| 1999 | 99.9 | 471 | 3% |
| 2000 | 114.3 | 629 | 2% |
| 2001 | 137.1 | 1170 | 4% |
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