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Mother Nature Network • What was the purpose of these giant, concrete...

26

Nov

What was the purpose of these giant, concrete arrows?Hundreds of 70-foot, bright yellow arrows once guided mail delivery pilots across the U.S., and many of them still exist today.

What was the purpose of these giant, concrete arrows?
Hundreds of 70-foot, bright yellow arrows once guided mail delivery pilots across the U.S., and many of them still exist today.

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