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Title from cover; "May 1991"
"July 2003."; "GAO-03-514."
iii; 99p.; "Printed for the use of the Committee on Energy and Natural Resources"; Distributed to some depository libraries in microfiche
Abstract Everest, Fred H.; Stouder, Deanna J.; Kakoyannis, Christina; Houston, Laurie; Stankey, George; Kline, Jeffery; Alig, Ralph. 2004. A review of scientific information on issues...
Includes bibliographical references (p. 22)