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first edition prepared by Robert N. Covington and Aaron A. Caghan ; for the Labor Law Group
Bureau of National Affairs c1974 2nd ed. / prepared by Robert N. Covington Labor relations and social problems unit 2
所蔵館7館
prepared by Robert N. Covington, James E. Jones and Aaron A. Caghan for the Labor Law Group
Bureau of National Affairs c1971 Labor relations and social problems unit 3
所蔵館4館
prepared by Robert N. Covington and Aaron A. Caghan for the Labor Law Group
Bureau of National Affairs c1971 Labor relations and social problems unit 2
所蔵館9館