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Areas of Importance
Great Blue Heron (GTBH)
19c Howard Slough
| Year | Mean | Peak | % of GSL Mean |
| 1997 | 31.8 | 54 | 5% |
| 1998 | 16.3 | 42 | 3% |
| 1999 | 5.8 | 11 | 1% |
| 2000 | 9.3 | 20 | 3% |
| 2001 | 5.8 | 12 | 2% |
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| Year | Mean | Peak | % of GSL Mean |
| 1997 | 31.8 | 54 | 5% |
| 1998 | 16.3 | 42 | 3% |
| 1999 | 5.8 | 11 | 1% |
| 2000 | 9.3 | 20 | 3% |
| 2001 | 5.8 | 12 | 2% |
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