The caloric value of a variety of southern forest fuels was determined in an oxygen bomb calorimeter. High heat values ranged between about 3,600 and 5,200 cal./g. for fuels as sampled and between 4,500 and 5,600 cal./g. for fuels on an ash-free basis. Additional tests of forest fuels from the Southern, Eastern, and North Central United States showed a wider range of heat values: from 3,400 to 7,800 cal./g. for fuels as sampled.
Hough, Walter A. 1969. Caloric Value of Some Forest Fuels of the Southern United States. Res. Note SE-120. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southeastern Forest Experiment Station. 6 p.