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1.
As many as to cover all the manholes in usa.
 
2.
As enough covers to cover the manhole.
 
3.
Not sure but I can find that answer for you.
 
4.
I don't know, does anyone know that?
 
5.
I don't know, but I can help you find out.
 
6.
80 million
 
7.
I hope as many as the manholes plus spare few.
 
8.
Enough too fill every hole I hope.
 
9.
I have no idea, but I'll bet there is a record of it some where.
 
10.
Between 100 to 150 million.