Physical description for original version: iv, 29 p. : 28 cm
書誌注記
Bibliography: p. 27-29
原資料等に関する注記
原資料の出版事項: Tallahassee, Fla. : U.S. Dept. of the Interior, Geological Survey ; Denver, Colo. : Open-File Services Section, Western Distribution Branch, 1986