TY - BOOK T1 - Resources for the 21st century :summary and conclusions of the International Centennial Symposium of the U.S. Geological Survey / DA - 1981. CY - Washington : AU - Whitmore, Frank C. CN - HC13 .W48 1981 CN - HC13 PB - U.S. Dept. of the Interior, Geological Survey, PP - Washington : PY - 1981. N1 - Includes list of speakers and participants at symposium. ID - 40804 KW - Natural resources KW - Environmental policy TI - Resources for the 21st century :summary and conclusions of the International Centennial Symposium of the U.S. Geological Survey / ER -