J. E. Ericson No description specified. 1-1 (1 Record) Documents Appendix E: Source-Specific Hydration Dating of Obsidian Artifacts from 4-Sbr-4241 and 4-Sbr-4520 Based On Analytical Results of Harvard Center for Archaeological Research and Development. in Fort Irwin Research Report 11 By Eliz. Skinner (1984)