Physical description for original version: iv, 16 p. : 28 cm
書誌注記
Includes bibliographical references (p. 16)
原資料等に関する注記
原資料の出版事項: Harrisburg, Pa. ; Denver, Colo. : U.S. Dept. of the Interior, U.S. Geological Survey : Books and Open-File Reports Section [distributor], 1990