Data Are For The Number Of Vehicles Registered As Of December 31St. Data For 1944 Are Estimated. Source: Data For 1895-1939: U.S. Bureau Of Public Roads, National Automobile Chamber Of Commerce, Facts And Figures Of The Automobile Industry, 1933, P. 10; 1943, P. 48. Data For 1940-1944: Public Roads Administration, Comparison Of Motor Vehicle Registration.
This NBER data series a01108 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01108
Release: NBER Macrohistory Database
National Bureau of Economic Research, Automobile Registrations, Passenger Cars, Total for United States [A01108USA258NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A01108USA258NNBR/, July 28, 2015.