1. Bulk density chapter 13;Blake,1986
2. Chappell, H.N., Cole, D.W., Gessel, S.P., and Walker, R.B. 1991. Forest fertilization research and practice in the Pacific Northwest Fertilizer Research 27, 129–140.
3. Soil development along an elevational transect in the western Sierra Nevada, California;Dahlgren;Geoderma,1997
4. Effects of forest growth on soil nitrogen and organic matter pools following release from subsistence agriculture;Hamburg,1984
5. Quantifying deep-soil and coarse-soil fractions: avoiding sampling bias;Harrison;Soil Science Society of America, Journal,2003