Interpretation of Triaxial Compression Tests on Granular Mixtures explores the fundamental inconsistencies in interpreting triaxial compression tests on various granular mixtures, presenting experimental data from the Civil Aeronautics Administration (CAA). William S. Housel analyzes these tests to demonstrate the flaws in applying the Coulomb equation and Mohr stress envelope to granular materials' stability. The work critiques the traditional reliance on these theories, asserting they violate the basic laws of static equilibrium. Instead, Housel offers an alternative approach based on the concept of internal stability through arching action and particle arrangement. The book includes detailed test results from various granular materials and compares analytical methods to highlight discrepancies in shearing resistance and internal stability. Housel's findings argue for a reevaluation of conventional theories and underscore the importance of precise mechanical analysis in understanding granular material behavior. The text is a critical contribution to soil mechanics, urging scholars and engineers to reconsider longstanding methodologies in favor of more accurate models.