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| | History of the United States Postal Service 1775-1993 |
 | | As mail delivery evolved from foot to horseback, stagecoach, steamboat, railroad, automobile, and airplane, with intermediate and overlapping use of balloons, helicopters, and pneumatic tubes, mail contracts ensured the income necessary to build the great highways, rail lines, and airways that eventually spanned the continent. |
 | | When railway mail service began, mostly letter mail was sorted on the cars, which were not equipped to distribute other kinds of mail. |
 | | The customer had to take a letter to the post office to mail it, and the addressee had to pick up the letter at the post office, unless he or she lived in one of about 40 big cities where a carrier would deliver it to the home address for an extra penny or two. |
| www.usps.com /history/his2.htm (2900 words) |
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