We all write and mail letters, and we have all heard tales of the neighborhood letter carrier being bitten by a dog. But what really happens once a letter slides into the mailbox? How many letter carriers actually get bitten by Fido? Finally, an up-to-date, easily accessible, and well-researched book that explains every aspect of the Postal Service--from where to take the postal office exam and how unions work, to salaries and benefits and the responsibilities...