Physical description for original version: vi, 78 p. : 28 cm
書誌注記
Bibliography: p. 72-73
原資料等に関する注記
原資料の出版事項: [Washington, DC] : U.S. Dept. of Agriculture, Economic Research Service in cooperation with the Foreign Agricultural Service : [Supt. of Docs., U.S. G.P.O., distributor], 1985