A statistical analysis of carriers' monthly hours of service reports :
covering all railroads which reported during the year ended June 30 ... instances in which employees were on duty for periods other than those provided by the Federal Hours of Service Act /
compiled by the Bureau of Safety.
Washington : Interstate Commerce Commission,
Hours of labor
Hours of labor /
Hours of labor / United States /
Railroads > Railroads / United States > Railroads / United States / Employees > Railroads / United States / Employees / Statistics.
Subtitles varies slightly.
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