http://pec.lib.wvu.edu/record/P176341920Local freight tariff of allowance of Tidewater Coal Exchange, Inc. Serial issue. Issued as: Coal and Coke Series I. C. C., no. 1919. "Issued April 29, 1920 … effective May 1, 1920."<br /><br />Baltimore and Ohio Railroad Company.Railroads--Freight--Rates--United States.Tidewater Coal Exchange, Inc.Coal transportation--United States.Coal mines and mining--United States.14256