Commemorating the 50th Anniversary of the First Workmen's Compensation Laws in United States Block of Stamps

FIRST DAY OF ISSUE COMMEMORATING 50%h Anniversary Art Craft OF THE FIRST WORKMEN'S COMPENSATION LAW IN UNITED STATES 1911-1961 SEP 4 9-AM 1961 WIS MILWA FORWARD WORKMEN'S COMPENSATION LAW 1911 1961 WORKMEN'S COMPENSATION W WISCONSIN 1911 1961 WISCONSIN WORKMEN'S COMPENSATION LAW FIRST DAY OF ISSUE 1911 WORKMEN'S COMPENSATION LAW 1961 WISCONSIN 1911 1961 WISCONSIN POSTAGE