Series Is Presented Here As Three Variables--(1)--Original Data, 1915-1933 (2)--Original Data, 1933-1948 (3)--Original Data, 1948-1961. These Data Were Taken From Reports Of About 102 Companies. Letter And Data Received By NBER From The Survey Of Current Business, Letter Of May, 1935. Class A Companies Are Those Having Annual Operating Revenues Of Over $250,000. Source: 1931 Office Records Of The Survey Of Current Business For 1915-1922 Data; 1932 Annual Supplement Of The Survey Of Current Business, Pp.122-123, For 1923-1930 Data; Survey Of Current Business, March 1933, For 1932; January, 1933 Through March, 1933 Data Were Computed.
This NBER data series m09003a appears on the NBER website in Chapter 9 at http://www.nber.org/databases/macrohistory/contents/chapter09.html.
NBER Indicator: m09003a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Net Operating Income, Class A Telephone Companies for United States [M0903AUSM144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0903AUSM144NNBR, February 14, 2016.