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2. American Society for Testing and Materials (1988 and other years). Annual Book of Standards. ASTM, Philadelphia, PA. 19103.
3. Barksdale, R. D. (1984). Thickness Design for Effective Crushed Stone Use. Proceedings, Conference on Crushed Stone for Road and Street Construction and Reconstruction. National Stone Assoc., VII-1 through VI-32. Washington, D.C. 20001.
4. Barksdale, R. D., and Itani, S.Y. (1989). Influence of Aggregate Shape on Base Behavior. Paper No. 880573 Presented at 1989 Transportation Research Board Meeting, 27 p.