Name Sites Samples
Blount County 3 43
Bolivar County 1 8
Bolivia 4 28
Boone County 1 6
Bosnia and Herzegovina 7 16
Bosque County 4 33
Botetourt County 5 29
Bottineau County 1 1
Bourbon County 3 4
Bowie County 5 26
Bradley County 1 1
Bradley County 1 1
Brazil 187 450
Brevard County 16 92
Brewster County 52 149
Bristol County 1 1
Broward County 9 16
Brown County 1 2
Brown County 17 40
Brunswick County 1 1
Bryan County 4 7
Buchanan County 1 3
Buckingham County 1 1
Bulgaria 9 39
Bullock County 1 1
Buncombe County 9 21
Burke County 1 5
Burke County 1 2
Burleigh County 4 65
Burleson County 2 10