Physical description for original version: v, 24 p. ; 28 cm
書誌注記
Includes bibliographical references (p. 23-24)
原資料等に関する注記
原資料の出版事項: Washington, DC (1301 New York Ave., NW, Washington, DC 20005-4788) : U.S. Dept. of Agriculture, Economic Research Service, Commodity Economics Division, 1990