Biomass of Food Available to Beavers on Five Minnesota Shrubs / Richard R. Buech and David J. Rugg.Richard R. Buech1995
Demand for commercially delivered domestic fuelwood in Colorado, 1980 / David R. Betters, John G. Hof, and Phyllis P. Ryan.David R. Betters1984
Cost, Time, and Benefit Measures for Personal Use Fuelwood Collection in Colorado / David R. Betters, Donald C. Markstrom, and Robert Aukerman.David R. Betters1990