http://pec.lib.wvu.edu/record/P75551923Agreement between the Baltimore and Ohio Railroad Company and that class of train dispatchers represented by the American Train Dispatchers' Association. Pamphlet. "Effective July 1, 1921." "Revised March 1, 1922 to apply Decision 721 of the United States Railroad Labor Board)." "Revised July 1, 1923 to apply Decision 1830 of the United States Railroad Labor Board." Baltimore and Ohio Railroad Company.Baltimore and Ohio Railroad Company--Employees--Rules and practice.Railroads--Employees--Labor unions--United States.Railroads--Employees--Rules and practice--United States.American Train Dispatchers' Association.14256