au.\*:("RIEFSTAHL CF")
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WORKSHOP SESSION FOR THE THIRD SESSION OF THE CONFERENCE IN THE MATTER OF POLLUTION OF LAKE MICHIGAN AND ITS TRIBUTARY BASIN, IN THE STATES OF WISCONSIN, ILLINOIS, INDIANA AND MICHIGAN, HELD IN THEBROUGH JR; DUNN JT; ETTESVOLD WL et al.sdS.L; U.S.GOV.PRINT.OFF.,1971, P. 1391 A 1719Miscellaneous