| http://www.w3.org/ns/prov#value | - When such States as New York, Pennsylvania, Ohio, and Illinois, with respectively 3,070, 3,681, 2,603, and 2,568 post-offices, are taken into consideration, some idea may be formed of the work required in preparing a system of distribution, the vigilance required to keep pace with the frequently changing schedules, and the study of the clerks to properly carry its requirements into effect.
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