Physical description for original version: vi, 136 p. ; 28 cm
書誌注記
Includes bibliographical references
原資料等に関する注記
原資料の出版事項: Washington, D.C. : U.S. Dept. of Labor, Labor-Management Services Administration, Bureau of Labor Statistics : For sale by the Supt. of Docs., U.S. G.P.O., 1982