Ffolliott, P.F., Irving, F.D and Duncan, D.P., (1960), "The Growth Potential of Black Walnut in Southeastern Minnesota", Minnesota Forestry Notes 97, School of Forestry, University of Minnesota
Minnesota Forestry Notes
Published as Scientific Journal Paper Series No. 4481 of the Minnesota Agricultural Experiment Station.
Ffolliott, P.F.; Irving, F.D.; Duncan, D.P..
The Growth Potential of Black Walnut in Southeastern Minnesota.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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