1. Bodman, G. B., and G. K. Constantin, 1965, Influence of particle size distribution in soil compaction: Hilgardia, v. 36, p. 567–591.
2. Bull, W. B., 1974, Information concerning geology and seismology,in Geomorphic tectonic analysis of the Vidal Region, Vidal Nuclear Generation Station, vol. III, appendix 2.5B, Southern California Edison Co. 66 pp.
3. Carter, L. M., 1967, Portable recording penetrometer measures soil strength profiles: Agric. Engl. J., v. 48, p. 348–349.
4. Crow, D. (ed.), 1982, Armored fighting vehicles of the world. v. 1: Garden City, N.Y., Doubleday, 240 pp.
5. Gile, L. H., and J. W. Hawley, 1968, Age and comparative development of desert soils at the Gardner Springs radiocarbon site, New Mexico: Soil Sci. Soc. Amer. Proc., v. 32, p. 709–716.