Manage updates with the Download AppU.S. mail trucks
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U.S. mail trucks lined up outside a Post Office sometime between 1909 and 1940. Today the USPS's 213,881 vehicles -- which is the largest civilian fleet in the world -- drive more than 1.2 billion miles each year.
February 6, 2013 1:55 PM PST
Photo by: Library of Congress
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