Release: NBER Macrohistory Database
Series Is Presented Here As Two Variables--(1)--Original Data, 1920-1942 (2)--Original Data, 1942-1955. Data Through January, 1943 Still Represent The Sum Of Separate Data For The Western Union And Postal Telegraph-Cable Companies. Data Were Merged In February, 1943 And Combined Figures Shown In F.C.C. Reports For February, 1943 And Thereafter. Source: The Federal Communications Commission, Operating Data From Monthly Reports Of Telegraph Carriers.
This NBER data series m09004b appears on the NBER website in Chapter 9 at http://www.nber.org/databases/macrohistory/contents/chapter09.html.
NBER Indicator: m09004b
National Bureau of Economic Research, Net Operating Income, Western Union and Postal Telegraph Companies for United States [M0904BUSM144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/M0904BUSM144NNBR, September 27, 2016.