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Zhang, Y. M. ;Mitchell, M. J. 1990. Sulfur constituents along a catena at the Hubbard Brook Experimental Forest : 342.
Bormann, F. H. 1991. The role of in the nitrogen economy of restored sites: report on the cooperative sandbox study at Hubbard Brook, New Hampshire
Bukaveckas, P. A. ;Likens, G. E. 1991. Long-term changes in the chemistry of inlet and outlet streams in the Mirror Lake watershed
Caraco, N. F. ;Cole, J. J. ;Likens, G. E. 1991. Iron:Phosphorus accumulation in hypolimnetic waters
Caraco, N. F. 1991. N:P release ratios from freshwater and coastal marine sediments
Findlay, S. E. 1991. Effects of watershed manipulations on stream food webs at Hubbard Brook: short-term perspectives of long-term processes : 98.
Gove, J. H. ;Martin, C. W. ;Patil, G. P. ;Solomon, D. S. ;Hornbeck, J. W. 1991. Species diversity on even-aged harvests at the Hubbard Brook Experimental Forest: 10-yr results : 29.
Likens, G. E.  Leopold, L. B. 1990. Insights from Hubbard Brook: Importances of long-term data : 3-24.
Likens, G. E. 1990. Long-term consequences of human effects on ecosystems : 17.
Likens, G. E. 1990. Sustained ecological research and formulation of public policy : 16.
Likens, G. E. 1990. Use, abuse and limits of the ecosystem concept
Martin, C. W. 1990. Chemistry of precipitation falling on New Hampshire forests, 1979-88
Pierce, R. S. ;Bormann, F. H. ;Likens, G. E.  Guertin, D. P. 1990. The ecosystem approach to forest hydrological research : 92-98.
Sherry, T. W. ;Holmes, R. T. 1990. Population dynamics of a long-distance migrant songbird: variability in time and space : 295.
Hedin, L. O. 1990. Importance of small streams in understanding watershed processes : 16.
Hedin, L. O. ;Likens, G. E. ;Driscoll, C. T. ;Postek, K. M. 1990. Role of organic acids in buffering inputs of mineral acidity to surface waters: a field experiment : 343.
Hedin, L. O. ;Likens, G. E. ;Postek, K. M. ;Driscoll, C. T. 1990. Role of organic acids in surface water acidification: experimental acidification of a brownwater stream
Holmes, R. T. ;Sherry, T. W. ;Sturges, F. W. 1990. Numerical and demographic responses of temperate forest birds to annual fluctuations in their food resources : 296.
Hornbeck, J. W. 1990. Cumulative effects of intensive harvest, atmospheric deposition, and other land use activities
Johnson, C. E. 1990. Nutrient cycling and landscape position at the Hubbard Brook Experimental Forest, New Hampshire : 334-335.