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| BACTERIA [13] |
| BAETIDAE [1] |
| BAETIS [12] |
| BAETISCIDAE [1] |
| BALANCE [7] |
| BANDING [8] |
| BANDS [1] |
| BARK [3] |
| BARTRAMIA [2] |
| BASIAESCHNA [1] |
| BASS [3] |
| BATESIAN [2] |
| BATS [11] |
| BEACH [1] |
| BEACHPOOL [23] |
| BEACHPOOLS [1] |
| BEAR [1] |
| BEAVER [27] |
| BEAVERS [1] |
| BEECH [3] |
| BEECH BARK DISEASE [1] |
| BEES [5] |
| BEETLES [27] |
| BEHAVIOR [731] |
| Behavior [2] |