id,name,description,createdAt,updatedAt,datasetId,additionalInfo,link,dataPublishedBy
15453,Letter postage - United States Postal Service,"{""link"": ""https://about.usps.com/who-we-are/postal-history/domestic-letter-rates-since-1863.pdf"", ""retrievedDate"": ""04/04/2018"", ""additionalInfo"": ""Postage rate refers to 1/2 ounces for 1863 and 1883. 1885 onward postage rates refer to 1 ounce letters. Two observations were reported for 1981, the average of the two observations is reported.\n\nThe real postage rates were calculated: \n\nReal postage rate = Nominal postage rate / ( Price Index / 100 )\n\nReal rates for stamped cards and postcards, and domestic letters were calculated using the annual consumer price index for the United States, available at: https://www.measuringworth.com/datasets/uscpi/\nFull reference: Samuel H. Williamson, \""The Annual Consumer Price Index for the United States, 1774-Present,\"" MeasuringWorth, 2018. "", ""dataPublishedBy"": ""United States Postal Service"", ""dataPublisherSource"": ""Historical data""}",2018-04-04 15:53:52,2018-04-13 13:55:16,2720,"Postage rate refers to 1/2 ounces for 1863 and 1883. 1885 onward postage rates refer to 1 ounce letters. Two observations were reported for 1981, the average of the two observations is reported.

The real postage rates were calculated: 

Real postage rate = Nominal postage rate / ( Price Index / 100 )

Real rates for stamped cards and postcards, and domestic letters were calculated using the annual consumer price index for the United States, available at: https://www.measuringworth.com/datasets/uscpi/
Full reference: Samuel H. Williamson, ""The Annual Consumer Price Index for the United States, 1774-Present,"" MeasuringWorth, 2018. ",https://about.usps.com/who-we-are/postal-history/domestic-letter-rates-since-1863.pdf,United States Postal Service