Thorud, D.B. and Frissell, S.S., Jr., (1976), "Time Changes in Soil Density Following Compaction Under an Oak Forest", Minnesota Forestry Research Notes 257, School of Forestry, University of Minnesota
Minnesota Forestry Research Notes
Published as Scientific Journal Paper Series No. 8990 of the Minnesota Agricultural Experiment Station.
Thorud, David B.; Frissell, Sidney S. Jr..
Time Changes in Soil Density Following Compaction Under an Oak Forest.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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