Chai, T.S. and Hansen, H.L., (1952), "Characteristics of Black Spruce Seed from Cones of Different Ages", Minnesota Forestry Notes 2, School of Forestry, University of Minnesota
Minnesota Forestry Notes
Published as Sci. Jour. Ser. Paper No. 2872 of the Univ. of Minn. Agr. Exp. Sta.
Chai, Tsan Sing; Hansen, Henry L..
Characteristics of Black Spruce Seed from Cones of Different Ages.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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