Release: NBER Macrohistory Database
Series Is Presented Here As Two Variables--(1)--Original Data, 1920-1942 (2)--Original Data, 1942-1956. This Variable Was Computed By NBER By Adding Western Union And Postal Telegraph Data. This Variable Ends In 1942, As A New Accounting Classification Was Introduced In 1943 Which Make The Earlier Figures Not Comparable. Source: Data For 1920-May 1934: Interstate Commerce Commission Files. Data For June 1934-1942: Federal Communications Commission, "Operating Data From Monthly Reports Of Telegraph Carriers".
This NBER data series m03019a appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: m03019a
National Bureau of Economic Research, Total Operating Revenues, Western Union and Postal Telegraph Companies for United States [M0319AUSM144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/M0319AUSM144NNBR, February 8, 2023.