Ahlgren, C.E., (1979), "Buried Seed in the Forest Floor of the Boundary Waters Canoe Area", Minnesota Forestry Research Notes 271, School of Forestry, University of Minnesota
Minnesota Forestry Research Notes
Published as Scientific Journal Paper Series No. 10928 of the Minnesota Agricultural Experiment Station.
Ahlgren, Clifford E..
Buried Seed in the Forest Floor of the Boundary Waters Canoe Area.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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