• Seymour, Robert S.
  College of Forest Resources, University of Maine, Orono
  
• Lemin Jr., Ronald C.
  Cooperative Forestry Research Unit, University of Maine
  

The procedures used to formulate empirical yield curves for the 1989 analysis of Maine timber supplies (Seymour and Lemin 1989) are described. Data were obtained from over 2000 plots measured by the USDA Forest Service during the 1979-81 inventory of Maine. Yields are summarized by seven species groups (spruce-fir, pine, hemlock-other softwood, cedar, maple-beech-yellow birch, aspen- white birch, and oak-ash) and three products (total merchantable, sawlog, and biomass) in each of twelve forest type-soil categories. Results are presented in both graphical and tabular form and compared to the smoothed curves used by Seymour and Lemin (1989).