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spec: Ames and Sedgwick were conspicuous among them . The fuels studied include coal , peat , wood-based fuels , biomasses , waste-derived fuels , and wastes . There are occasional runs of names and places , but also infuriating gaps : for example , lists of children of parents who appear out of thin air . This conclusion applied to 3 alleles at the Bp locus and to the Rp4 and Rp5 loci . Combustion of solid fuels ( coal , peat , biomass , waste ) is a common way to produce power and heat . In the reduction of briquets to coal equivalent , different conversion factors are applied according to their origin from hard coal , peat , brown coal , or lignite .