Ecological characteristics of old-growth Douglas-fir forests. Franklin, J. F., Cromack, K., Denison, W. C., McKee, W. A., Maser, C., Sedell, J. R., Swanson, F. J., & Juday, G. Volume 118 , U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, Portland, OR, 1981.
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