Desai, A.R., B.D. Cook, K.J. Davis, P.V. Bolstad, E.V. Carey, J.M. Martin, L.J. Kreller, and W. Wang, 2003. Old and Not-So-Old: Examining changes in forest ecosystem carbon exchange with stand age in the upper Midwest U.S., Fall Meeting of the American Geophysical Union, American Geophysical Union, San Francisco, CA.