Completed Day, M.E. 2000. Factors influencing net primary production in red spruce. Ph.D. dissertation. University of Maine, Orono, ME. Hartley, M.J. 2003. Effects of small-gap timber harvests on songbird community composition and site-fidelity. Ph.D. thesis, University of Maine, Orono. PDF available Jaros-Su, J. C. 1999. Insect biodiversity in managed forests. Ph.D. dissertation. University of Maine,