1. Berry, A., andTorrey, J.G. 1979. Isolation and characterization in vivo and in vitro of an actinomycetous endophyte fromAlnnus rubra Bong., pp. 69?83,in J.C. Gordon, C.T. Wheeler, and D.A. Perry (eds.). Symbiotic Nitrogen Fixation in the Management of Temperate Forests. Oregon State University Press, Corvallis.
2. Brooks, M.G. 1951. Effect of black walnut trees and their products on other vegetation. W.V. Univ. Agric. Exp. Sta. Bull. 347, Morgantown, 31 pp.
3. Dawson, J.O.,Knowlton, S., andSun, S.-H. 1981. The effect of juglone concentration on the growth ofFrankia in vitro. Univ. Ill. Agric. Exp. Sta., Forestry Res. Rep. 81-2, Urbana, 2 pp.
4. Funk, D.T., Schlesinger, R.C., andPonder, F., Jr. 1979. Autumn-olive as a nurse plant for black walnut.Bot. Gaz. 140(Suppl.):S110-S114.
5. Gabriel, W.J. 1975. Allelopathic effects of black walnut on white birches.J. For. 73:234?237.