1. Foundations. 2. Gauge Theory for Matrix Lie Groups. 3. Kinematics of Defects. 4. Inhomogeneous Action of the Fundamental Group. 5. Kinetics of Defects in Elastic Dielectrics. 6. Gauge Conditions, Observables, and Internal Space. 7. Boundary Conditions, Null Lagrangians, and Effective Stresses. 8. Lagrangians, Material Symmetries, and Field Equations. 9. Scales, Approximations, and Solutions. References. Index.