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This chapter contains sections titled: Radar Principle Radiation Principle Radiation Protection Principle Radioimmunoassay Principle Radioisotope Field Support Principle Radish Pungent Principle Ranking Principle Ref…Ranking Principle Programming by Recall Level Raoult's Principle Rayleigh-Jeans Principle Rayleigh Principle Rayleigh-Ritz Minimum Principle Reaction Principle Reactivity/Selectivity Principle Reality Principle Reality Principle Recapitulation Principle Recency Principle Reciprocity Principle Recirculating Principle Recurring Principle Recursive Induction Principle Red Queen's Principle Reflected Beam Principle Reflection Principle Reflectionless Aperture Principle Regenerative Braking Principle Regenerative Heating Principle Regenerative Principle Regret Principle Regulatory Principles and Other Regulatory Principles of Inertia Regulatory Principles of Constancy Regulatory Principles of Pleasure-Unpleasure Regulatory Principles of Primary-Secondary Process Regulatory Principles of Reality Regulatory Principles of Repetition Reichenbach's Common Cause Principle Reinterpretation Principle Reissner Two-Field Principle Reissner Two-Field Stress and Displacement Principle Reissner Variational Principle Relative Frequency Principle Relativity Principle Relaxation Principle Relaxed Invariance Principle Release Reuse Equivalency Principle (REP) Reluctance Principle Repulsion Principle Resistance Principle Resistance Welding Principle Resolution Principle Resonance Principle Resource Consumption Principle Respective Inspecting Principle Response-Shaping Principle Revelation Principle Revenue Recognition Principle Reverse-Heat-Engine Principle Reversed Fick Principle Reversibility Principle Revised Principle Revision Principle Rf Marketing Principle Ricoeur's Principle of Distanciation Riecke's Principle Rissanen's Minimum Description-Length Principle Rittinger's Principle Ritz's Combination Principle Rochdale Principle Rocket Principle Rogers' Principles Roller Wedge Principle Roots Principle Rotary Vane Pump Principle Rotational Acceleration Principle Ruin-And-Re-Create Principle Rule Chaining Principle Rule of Product Principle Rule of Sum Principle Rydberg-Ritz Combination Principle