Physical description for original version: vi, 122 p. : 28 cm
書誌注記
Includes bibliographies
原資料等に関する注記
原資料の出版事項: Reston, Va. ; Denver, Colo. : U.S. Dept. of the Interior, Geological Survey : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey, [distributor], 1983