Physical description for original version: v, 39 p. : 28 cm
書誌注記
Includes bibliographical references (p. 14)
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 Commerce, Economics and Statistics Administration, Bureau of the Census : For Sale by Supt. of Docs., U.S. G.P.O., [1991]