Ruckman Coal Company. In matter of Ruckman 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-1409 and R-1606; supplemental decision and certification of representatives, Feb. 28, 1940.

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