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|  | | Douglas-fir bark as a trickling filter medium for animal waste disposal systems (Technical bulletin / Oregon State University, Agricultural Experiment Station)
by Myron George Cropsey
Unknown Binding, 11 Pages, Published 1973 by Agricultural Experiment Station, Oregon State University
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|  | | Ventilating poultry laying houses (Station bulletin / Oregon Agricultural College Experiment Station)
by Myron George Cropsey
Unknown Binding, 12 Pages, Published 1956 by Agricultural Experiment Station, Oregon State College
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|  | | Engineering aspects of soil heat extraction (Technical bulletin / Oregon State University, Agricultural Experiment Station)
by Myron George Cropsey
Unknown Binding, 31 Pages, Published 1969 by Agricultural Experiment Station, Oregon State University
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