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william h covey
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A time study of shearing wild stands of Douglas-fir Christmas trees
William H. Covey · School of Forestry, Montana State University
14 sayfa · 1960
Douglas fir / Pruning / Christmas tree growing
Christmas tree plantations
William H. Covey · Forest and Conservation Experiment Station, School of Forestry, Montana State University
14 sayfa · 1956
Christmas tree growing