The Transportation Industries at the Outbreak of World War II
    Published Date 
  
  
    Copyright 1951
  
  
    ISBN 0870140507
  
 
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      Copy CitationHarold Barger, The Transportation Industries, 1889-1946: A Study of Output, Employment, and Productivity (NBER, 1951), chap. 1, https://www.nber.org/books-and-chapters/transportation-industries-1889-1946-study-output-employment-and-productivity/transportation-industries-outbreak-world-war-ii.
 
     
    