Physical description for original version: v, 39 p. : 28 cm
書誌注記
Bibliography: p. 39
原資料等に関する注記
原資料の出版事項: Louisville, Ky. ; Lakewood, Colo. : U.S. Dept. of the Interior, Geological Survey : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey [distributor], 1985