http://pec.lib.wvu.edu/record/P169211930List of coal mines and coke ovens located on the Baltimore & Ohio System and lateral lines, including names of operators, locations, post office addresses and audit numbers. <p> Serial issue. Issued as: Baltimore and Ohio Railroad Company. Accounting Dept. <em>Circular,</em> no. n.s.100. "Revised to October 1, 1930 (Cancels issue of April 1, 1930.) Issued by L. A. Lambert, Auditor, Coal and Code Receipts, Baltimore, Md."</p>Baltimore and Ohio Railroad Company.Coal--Transportation--Northeastern States--Directories.Baltimore and Ohio Railroad Company--Directories.Coke industry--Northeastern States--Directories.Coal mines and mining--Northeastern States--Directories.14256