Flat Creek Coal Company. In matter of Flat Creek Coal Company and United Mine Workers of America, District No. 23, affiliated with C. I. O. and Progressive Mine Workers of America, District No. 5, affiliated with A. F. of L., party to contract; in matter of [same] and United Mine Workers of America, District No. 23, affiliated with C. I. O., cases nos. C-1403 and R-1603; supplemental decision and certification of representatives, Mar. 29, 1940.