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- Canada 13 results
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- Caribbean Area 2 results
- Caribbean Region 1 results
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- Caroline du Nord 1 results
- Caroline du Sud 1 results
- Celery Farm Natural Area (Allendale, N.J.) 1 results
- Chester Co 1 results
- Chester County 1 results
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- Clark County 1 results
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- Cornwall, Eng 1 results
- Crawford County 1 results
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- Crosswicks Wildlife Sanctuary (Wyncote, Pa.) 1 results
- Cumberland 1 results
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- Cumberland Valley 1 results
- Darke County 1 results
- Dauphin Co 1 results
- Delaware 5 results
- Delaware Bay (Del. and N.J.) 1 results
- Delaware Co 2 results
- Delaware County 2 results
- Delaware County (Pa.) 2 results
- Delaware River (N.Y.-Del. and N.J.) 2 results
- Delaware River Basin 1 results
- Delaware River Valley (N.Y.-Del. and N.J. 1 results
- Delaware River Valley (N.Y.-Del. and N.J.) 2 results
- Delaware River Watershed (N.Y.-Del. and N.J. 1 results
- Delta County 1 results
- Devon 1 results
- Devon (England) 1 results
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- Douglas, Isle of man 1 results
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