Book excerpt: Title 20-EMPLOYEES' BENEFITS is composed of four volumes. The first volume, containing parts 1-399, includes current regulations issued by the Office of Workers' Compensation Programs, Department of Labor and the Railroad Retirement Board. The second volume, containing parts 400-499, includes all current regulations issued by the Social Security Administration. The third volume, containing parts 500 to 656, includes current regulations issued by the Employees' Compensation Appeals Board, and the Employment and Training Administration. The fourth volume, containing part 657 to End, includes the current regulations issued by the Office of Workers' Compensation Programs, the Benefits Review Board, the Office of the Assistant Secretary for Veterans' Employment and Training Service (all of the Department of Labor) and the Joint Board for the Enrollment of Actuaries. The contents of these volumes represent all current regulations codified under this title of the CFR as of April 1, 2017. An index to chapter III appears in the second volume