Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Net Ton-Miles per Loaded Wagon Mile, Seasonally Adjusted

Frequency:  Quarterly

Series Is Presented Here As Two Variables--(1)--Original Data, 1920-1939 (2)--Seasonally Adjusted, 1944-1952. Source: Computed By NBER By Dividing Series (Net Ton-Miles) By Series (Loaded Wagon-Miles).

This NBER data series q03077 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.

NBER Indicator: q03077