Andrew M. Barton, Mathew D. Wallenstein, Effects of Invasion of Pinus virginiana on Soil Properties in Serpentine Barrens in Southeastern Pennsylvania, The Journal of the Torrey Botanical Society, Vol. 124, No. 4 (Oct. - Dec., 1997), pp. 297-305
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Andrew M. Barton (1997) studied this question.
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