Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Thousands of Tons, Not Seasonally Adjusted

Frequency:  Quarterly

Notes:

Source: Interstate Commerce Commission, Data For 1920-1923: "Statistics Of Railways", 1920, P. Xxxiv; 1921, P. Cix; 1922, P. Ciii; 1923, P.Xciv; Data For 1924-1943: "Freight Commodity Statistics: Quarterly Reports"

This NBER data series q03069 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.

NBER Indicator: q03069