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How Many States Are in the U.S.A.?
history.howstuffworks.com/american-history/how-many-states-usa.htm
The U.S. comprises states, territories and commonwealths. So how many states are in the U.S.A.?
How Green Pavement Works
science.howstuffworks.com/environmental/green-science/green-pavement.htm
Green pavement is porous, meaning that it permits water to seep through to the ground. Learn why green pavement is good for the environment.
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