http://pec.lib.wvu.edu/record/P176481923Baltimore and Ohio Railroad Company Eastern Lines distribution of cars for coal loading, June, 1923, and mine ratings effective July 16, 1923.Serial issue. Issued as: Baltimore and Ohio Railroad Company. Eastern Lines. <em>Bulletin</em>, no.6-B.Baltimore and Ohio Railroad Company. Eastern Lines.Baltimore and Ohio Railroad Company.Coal transportation--United States.Coal mines and mining--United States.14256