In 1983, the federal government reinstituted Official stamps to provide a method of prepaying postage by government offices and officials, particularly offices in rural regions. This cover is from the Department of Agriculture Soil Conservation Service in Doniphan, Missouri, to the Department of Agriculture Soil Conservation Service in Columbia, Missouri. It is dated September 10, 1984, and bears a 17-cent and a 20-cent stamp.
Brummell, George. “A short account of the franking system in the post office, 1652-1840: with a description of the postmarks used in connection therewith." Bournemouth Guardian, Bournemouth, Great Britain, 1936.
"Postage rates: Abstract of law fixing rates of postage and according free mail privileges. Passed between 1789-1930." US Government Printing Office, Washington, D.C. 1930.
Glassman, Matthew. "Franking Privilege: Historical Development and Options for Change." Congress Government and Finance Division, December 5, 2007.
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