are felled. This term can also refer to the monetary value of standing timber calculated before trees are cut. Sustainable Forestry Initiative (SFIr) A comprehensive system of principles, objectives and performance measures developed by foresters, conservationists and scientists that combines the perpetual growing and harvesting of trees with the protection of wildlife, plants, soil and water quality. For more information, please go to http://www.afandpa.org/ Sustained yield The periodic yield of timber that a given forest area can produce indefinitely at a given intensity of management. Thinning Intermediate cutting made in immature stands to stimulate the growth of the trees that remain. Timber Mart-South A non-profit organization, housed at the University of Georgia's School of Forest Resources, that publishes southern timber price information. Tree farm A tract of land on which trees are regenerated, cultured, managed and harvested as a crop primarily for commercial purposes. Veneer Wood peeled, sawn, or sliced into thin sheets of a given thickness. Heavily used in the furniture industry as well as the plywood industry. Waferboard A wood panel made of discrete wafers of wood bound together by resin, heat and pressure. Lower quality hardwoods are often used in the production of waferboard. Western hemlock Commercially important softwood tree species grown primarily in the Northwest. Wood supply agreement An agreement to supply wood fiber for a predetermined time at a predetermined price. Woodlands A term used to describe forested areas consisting of both hardwood and softwood species.