1. Agapito, J. F. T.: ?Pillar Design in Competent Bedded Formation?, Ph. D. Thesis, Colorado School of Mines, 1965 pp., Golden, Colo., 1972.
2. Brady, B. T., W. I. Duvall, and F. G. Horino: ?Experimental Determination of the True Uniaxial Stress-Strain Behavior of Brittle Rock?, Rock Mechanics, Vol. 5, pp. 107?120, 1973.
3. Brady, B. T., and W. I. Duvall: ?Strengthening of Fractured Rock Pillars by the Use of Small Radial Reinforcement Pressure?, U. S. BuMines, Rept. of Investigations, 7755, 1973.
4. Horino, F. G., and V. E. Hooker: ?The Mechanical Properties of Oil Shale and In Situ Stress Determinations, Colony Mine?, BuMines Progress Report DMRC 10001, 17 pp. Dec. 1971.
5. Horino, F. G., B. T. Brady, W. I. Duvall, and V. E. Hooker: ?A Thousand-Ton Capacity Stiff-Testing Machine?, BuMines R. I. 7624, 19 pp., 1972.