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Aber JD, Goodale CL, Ollinger SV, Smith M-L, Magill AH, Martin ME, Hallett RA, Stoddard JL. Is nitrogen deposition altering the nitrogen status of northeastern forests?.  2003;53(4):375-389.\par \par Hallett RA, Aber JD, Millham S, McNulty SG, Melillo JM, Steudler P, Castro M. Predicting trends in net nitrogen mineralization and nitrification across a regional transect using in-lab soil incubations. Canadian Journal of Forest Research. 2000.\par \par Hislop JE, Hornbeck JW, Bailey SW, Hallett RA. Development of internal forest soil reference samples and testing of digestion methods.  1998;29(11-14):1991-1996.\par \par Magill AH, Downs MR, Nadelhoffer KJ, Hallett RA, Aber JD. Forest ecosystem response to four years of chronic nitrate and sulfate additions at Bear Brooks Watershed, Maine, USA. Forest Ecology and Management. 1996;84:29-37.\par \par }