http://pec.lib.wvu.edu/record/P142651950-1955Safety letter. Serial. Printed Ephemera Collection has: 1950:Dec.-1951:Mar., 1951:May-1952:Jan., 1952:May, 1952:July, 1952:Sept.-1953:Jan., 1953:Mar., 1953:July, 1953:Oct.-1953:Nov., 1954:Jan.-1954:Feb, 1954:Aug.-1955:Jan.<br />West Virginia. Department of Labor.Industrial safety--West Virginia--Periodicals.14256