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 J. L.  Campbell, et al., ?Long-term trends from ecosystem research at the Hubbard Brook Experimental Forest?, Gen. Tech. Rep. NRS-17. Newtown Square, PA: U.S. Dept. Agriculture, Forest Service, Northern Research Station, p. 41, 2007.\par \par  T. G.  Siccama, et al., ?Population and biomass dynamics of trees in a northern hardwood forest at Hubbard Brook?, Can. J. For. Res., vol. 37, p. 737-749, 2007.\par \par  T. J.  Fahey, et al., ?The biogeochemistry of carbon at Hubbard Brook?, Biogeochemistry, vol. 75, p. 109-176, 2005.\par \par  I.  Fiorentino, T. J.  Fahey, P. M.  Groffman, C. T.  Driscoll, C.  Eagar, and T. G.  Siccama, ?Initial responses of phosphorus biogeochemistry to calcium addition in a northern hardwood forest ecosystem?, Can. J. For. Res., vol. 33, p. 1864-1873, 2003.\par \par  G. E.  Likens, et al., ?The biogeochemistry of sulfur at Hubbard Brook?, Biogeochemistry, vol. 60, p. 235-316, 2002.\par \par  J. D.  Blum, et al., ?Mycorrhizal weathering of apatite as an important calcium source in base-poor forest ecosystems?, Nature, vol. 417, p. 729-731, 2002.\par \par  N. S.  Scott, G. E.  Likens, J. S.  Eaton, and T. G.  Siccama, ?Loss of trace metals following whole-tree harvest of a northeastern deciduous forest?, Biogeochemistry, vol. 54, p. 197-217, 2001.\par \par  P. J.  Bohlen, P. M.  Groffman, T. J.  Fahey, C. T.  Driscoll, and T. G.  Siccama, ?Plant-soil-microbial interactions in a northern hardwood forest?, Ecology, vol. 82, p. 965-978, 2001.\par \par  C. E.  Johnson, C. T.  Driscoll, T. G.  Siccama, and G. E.  Likens, ?Element fluxes and landscape position in a northern hardwood forest watershed ecosystem?, Ecosystems, vol. 3, p. 159-184, 2000.\par \par  G. E.  Likens, et al., ?The biogeochemistry of calcium at Hubbard Brook?, Biogeochemistry, vol. 41, p. 89-173, 1998.\par \par  R. B.  Romanowicz, C. T.  Driscoll, T. J.  Fahey, C. E.  Johnson, G. E.  Likens, and T. G.  Siccama, ?Changes in the biogeochemistry of potassium following a whole-tree harvest?, Soil Sci. Soc. Am. J., vol. 60, p. 1664-1674, 1996.\par \par  C. E.  Johnson, T. G.  Siccama, C. T.  Driscoll, G. E.  Likens, and R. E.  Moeller, ?Changes in lead biogeochemistry in response to decreasing atmospheric inputs?, Ecol. Appl., vol. 5, p. 813-822, 1995.\par \par  G. E.  Likens, et al., ?The biogeochemistry of potassium at Hubbard Brook?, Biogeochemistry, vol. 25, p. 61-125, 1994.\par \par  T. G.  Siccama, S. P.  Hamburg, M. A.  Arthur, R. D.  Yanai, F. H.  Bormann, and G. E.  Likens, ?Corrections to allometric equations and plant tissue chemistry for Hubbard Brook Experimental Forest?, Ecology, vol. 75, p. 246-248, 1994.\par \par  C.  Veen, D. C.  Buso, C. A.  Federer, and T. G.  Siccama, ?Structure and function of the Hubbard Brook Data Management System?, Bull. Ecol. Soc. Am., vol. 75, p. 45-48, 1994.\par \par  C. T.  Driscoll, C. E.  Johnson, T. G.  Siccama, and G. E.  Likens, ?Biogeochemistry of trace metals at the Hubbard Brook Experimental Forest, NH?, in Proceedings of the 1990 EPA/Air and Waste Management Association International Symposium: Measurement of Toxic and Related Air Pollutants, 1990, p. 635-648.\par \par  K. C.  Weathers, et al., ?Chemical concentrations in cloud water from four sites in the eastern United States?, in M. H. Unsworth and D. Fowler (eds.). Acidic Deposition at High Elevation Sites, 1988, p. 345-357.\par \par  K. C.  Weathers, et al., ?Cloudwater chemistry from ten sites in North America?, Environ. Sci. Technol., vol. 22, p. 1018-1026, 1988.\par \par  K. C.  Weathers and T. G.  Siccama, ?A comparison of nutrient concentrations in two poisonous and three nonpoisonous species of sumac (Rhus spp.)?, Am. Midl. Nat., vol. 116, p. 209-212, 1986.\par \par }