| http://www.w3.org/ns/prov#value | - The power vested in Congress 'to establish post-offices and post-roads' has been practically construed, since the foundation of the government, to authorize not merely the designation of the routes over which the mail shall be carried, and the offices where letters and other documents shall be received to be distributed or forwarded, but the carriage of the mail, and all measures necessary to secu
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