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J. Blake, S. Gessel, S. R. Webster, 1988 .

Fixation of Nitrogen by Bitterbrush (Purshia tridentata (Pursh) D.C)

A. G. Wollum, C. T. Youngberg, S. R. Webster, 1967, Nature.

Different nitrogen sources for fertilizing western hemlock in western Washington

S. Gessel, M. Radwan, D. Debell, 1984 .

Comparison of Fall and Spring Application of 15N-Labeled Urea to Douglas-Fir: I. Growth Response and Nitrogen Levels in Foliage and Soil 1

T. Dao, P. Heilman, S. Harper, 1982 .

Douglas Fir Growth and Foliar Nutrient Responses to Nitrogen and Sulfur Fertilization

H. N. Chappell, J. Blake, S. Gessel, 1990 .