Physical description for original version: iv, 38 p. : 23 cm
書誌注記
Bibliography: p. 37-38
原資料等に関する注記
原資料の出版事項: [Reston, Va.?] ; Alexandria, VA : U.S. Dept. of the Interior, Geological Survey : For sale by the Distribution Branch, U.S. Geological Survey, 1984