Pearthree, P.A., and Biggs, T.H., 1999, Surficial geology and geologic hazards of the Tucson Mountains, Pima County, Arizona: Avra, Brown Mountain, Cat Mountain, and Jaynes 7.5' quadrangles: Arizona Geological Survey, Open-file Report 99-22, 19p., 2 sheets 1:24,000 scale.

Biggs, T.H., Quade, J. and Webb, R.H., (in revision), Fire, nutrient concentrations, and ?13C of soil organic matter in a southeastern Arizona desert grassland: Geoderma.

Biggs, T.H., Webb, R.H., and Quade, J., 1999, Fire frequency and spatial variability of soil biogeochemistry and plant biochemistry in a southeastern Arizona desert grassland, in, Gottfried, G.J., Eskew, L.G., Curtin, C.G., and Edminster, C.B., compilers, Toward integrated research, land management, and ecosystem protection in the Malpai borderlands: Conference Proceedings RMRS-P-10, USDA Forest Service, Rocky Mountain Research Station, Fort Collins, CO, January 1999, Douglas, AZ.

Biggs, T.H., Leighty, R.S., Skotnicki, S.J., and Pearthree, P.A., 1999, Geology and geomorphology of the San Bernardino Valley, southeastern Arizona: Arizona Geological Survey, Open-file Report 99-19, 20p., 3 sheets 1:32,000 scale.

Virginia Publications

Bartlett, C.S., Jr., and Biggs, T.H., 1980, Geology of the Abingdon, Shady Valley, Wyndale and Holston Valley, Virginia 7.5-minute quadrangles: Virginia Division of Mineral Resources, Publication 16.

Rader, E.K., and Biggs, T.H., 1976, Geology of the Strasburg and Toms Brook, Virginia 7.5-minute quadrangles: Virginia Division of Mineral Resources, Report of Investigations #45.

Rader, E.K., and Biggs, T.H., 1975, Geology of the Front Royal, Virginia 7.5-minute quadrangle: Virginia Division of Mineral Resources, Report of Investigations #40.