Physical description for original version: v, 65 p. : 28 cm
書誌注記
Includes bibliographical references (p. 61-65)
原資料等に関する注記
原資料の出版事項: [Reston, Va.?] ; Washington ; Denver, CO : U.S. Dept. of the Interior, U.S. Geological Survey : U.S. G.P.O. : For sale by Book and Open-file Report Sales, 1992