Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Millions of Dollars, Not Seasonally Adjusted

Frequency:  Monthly

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