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United States / PA

Sub-locations

Name Sites Samples
Adams County 1 1
Allegheny County 17 193
Armstrong County 8 21
Beaver County 8 38
Bedford County 8 25
Berks County 6 19
Blair County 8 27
Bradford County 14 43
Bucks County 3 27
Butler County 3 9
Cameron County 3 4
Carbon County 2 5
Centre County 9 41
Chester County 8 35
Clarion County 5 36
Clearfield County 4 34
Clinton County 13 144
Columbia County 4 41
Crawford County 4 12
Dauphin County 5 53
Elk County 2 11
Erie County 10 40
Fayette County 11 54
Forest County 2 7
Franklin County 2 8
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