ANNOTATION: Located here are tables of heat of combustion (Btu/ovendry pound) of stems and branches of 6-inch trees from 22 hardwood species growing on southern pine sites. Heat value, or heat of combustion, which is defined as the total amount of heat obtainable from ovendry material when burned in an enclosure of constant volume, allowing no deductions for heat losses, is a very useful parameter to know when dealing with biomass. DATA REQUIREMENTS: Species.