Physical description for original version: iv, 23 p. : 28 cm
書誌注記
Bibliography: p. 22-23
原資料等に関する注記
原資料の出版事項: Lakewood, Colo. ; Denver, CO : U.S. Dept. of the Interior, Geological Survey : Open-File Services Section, Western Distribution Branch, 1985 [i.e. 1986]