Physical description for original version: xi, 249, 91 folded p. of plates : 28 cm
書誌注記
Bibliography: p. 159-160
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 Agriculture, Soil Conservation Service in cooperation with the Iowa Agriculture and Home Economics Experiment Station, [1985]