Crunch time at US Postal Service: Five questions about post office closings.

Among the thousands of post offices under review for closure is a cramped branch in downtown Elmira, N.Y. , bustling on a rainy summer afternoon. It was, until recently, a place retiree Charlotte Dumas took for granted. She visits the downtown branch about three times a week. “I would hate to see it close,” she says. “It’s so convenient.” And it’s a bargain. The United States Postal Service …

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