Jornada Bibliography

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Virginia R.A, Jarrell W.M, Rundel P.W, Shearer G., Kohl D.H.  1989.  The use of variation in the natural abundance of 15N to assess symbiotic nitrogen fixation by woody plants. Stable Isotopes in Ecological Research. Ecological Studies:375-395.
Virginia R.A, Jarrell W.M.  1987.  Approaches for studying the function of deep root systems. Plant Response to Stress. :107-127.