Kapitza Conductance and Surfaces.- The Thermal Boundary Resistance (invited paper).- Reflection Coefficient of Phonons between 15 and 200 GHz at a Solid-Liquid Helium Interface.- A Model of Inelastic Heat-Transfer Mechanism for the Excess Kapitza Conductance.- A New Kapitza Investigation: Detecting Backscattered Phonons with Tunnel Junction and Bolometer Simultaneously.- The Angular Distribution of Phonons Radiated from the Cleaved 100 Faces of NaF, KCl, and MgO into Liquid 4He.- Energy Transfer between a Solid and Helium by Excited Atoms.- Path-Integral Formulation of the Theory of Thermal Boundary Resistance.- The Role of Electrons in the Kapitza Resistance of Lead.- Influence of Dislocations on the Kapitza Conductance of Clean Copper Surfaces.- Influence of Surface Contamination on the Kapitza Conductance of Copper, Silver, Molybdenum, and Beryllium.- A Direct Approach to Finite Phonon Transport (Realistic Transfer at Boundaries).- Reflection of Phonons in Liquid 4He from Solid Surfaces.- The Thermal Boundary Resistance at Epoxy-Resin/Metal Interfaces at Liquid Helium Temperatures.- Determination of Kapitza Conductance from the Velocity of Destruction of Superconductivity by Current.- Computer-Simulated Scattering of Envelope Soliton from Impurity and Interface in a One-Dimensional Nonlinear Lattice.- Surface Phonon Scattering by Density Fluctuation on Solid Surfaces.- Theory of Rayleigh Wave Scattering by Mass Defects and Surface Roughness.- Phonon Diffusion in a Temperature Gradient.- Phonon Diffusion and Temperature Field in Metals.- Role of Umklapp in Acoustic Boundary Resistance.- Discussion on Kapitza Conductance and Surfaces.- Second and Zero Sound.- Propagation in Liquid Helium (invited paper).- A First Step Towards Zero Sound in Ionic Crystals.- Low Temperature Thermal Conductivity of (NO3)2Ba, (NO3)2Sr, and (NO3)2Pb Single Crystals.- Ballistic Phonons and the Transition to Second Sound in Solid 3He.- On the Temperature Behavior of Second Sound and Poiseuille Flow in Solids.- The Propagation of High Frequency Thermal Waves in Dieletric Crystals.- Light Scattering from Second Sound in NaF.- Discussion on Second and Zero Sound.- Amorphous Systems.- Phonon Scattering in Amorphous Solids (invited paper).- Low-Energy Phonons in Amorphous Materials (invited paper).- Propagation of Ultrasonic Longitudinal and Transverse Sound Waves in Glasses at Very Low Temperatures.- Phonons in Some Amorphous Solids.- Observation of Direct Interaction between Low-Energy Excitations in Glasses.- Virtual Phonon Exchange in Glasses.- Influence of Phase Separation on the Thermal Conductivity of Potassium Borosilicate Glasses between 1K and 10K.- Influence of OH Content on the Specific Heat and Thermal Conductivity of Vitreous Silica below 1 Kelvin.- The Thermal Conductivity and Diffusivity of Epoxy-Resin from 2 to 80K.- Very Low Frequency Raman Scattering of Glasses.- Brillouin Scattering Study of Thermal Phonons in Crystal Quartz, Fused Quartz, and Borosilicate Glass at Low Temperature.- Discussion on Amorphous Systems.- Magnetic Ions and Molecular Defects.- Spin-Phonon Interactions (invited paper).- Phonon Scattering Induced by Jahn-Teller Impurities.- Resonance Scattering of Phonons at Trigonal Jahn-Teller Centers.- Multimode Jahn-Teller Effects of Ions in Al2O3.- Defect Scattering of Nearly Monochromatic Acoustic Phonons.- Temperature Dependence of the Acoustic Paramagnetic Resonance Spectra for Cr2+ in MgO and KMgF3.- Stress-Induced Changes in the Acoustic Paramagnetic Resonance of Chromous Ions in Magnesium Oxide.- Ultrasonic Relaxation Studies of Cr2+ in MgO.- Contribution to the Study of 3d4 Ions in Al2O3 and MgO by Low Temperature Thermal Conductivity Measurements under Uniaxial Stress.- Heat Pulse Investigations of MgO:Cr2+.- Thermal Conductivity of Irradiated, Additively-Colored, and Deformed MgO.- Phonon Scattering by Ni3+ Ions in Al2O3.- Determination of the Linear Jahn-Teller Coupling Constant of Ni3+ in Al2O3 by Low Temperature Thermal Conductivity Measurements under Uniaxial Stress.- Phonon Spectroscopy in Al2O3 Doped with Transitional Metal Impurities.- An Investigation of Frequency Crossing Effects in Phonon Scattering by V3+ Ions in Al2O3.- An Investigation of the Point Defect Scattering of Phonons by Minute Concentrations of Cr4+ in Corundum by Thermal Techniques.- A Study of Phonon-Spin Interaction in the System 3d1 in Al2O3.- Temperature Dependence of the Lifetime of 29cm?1 Phonons in Ruby between 3 and 17K.- A Study of Spin-Phonon Interactions by Spin-Relaxation Processes.- Intermediate Lattice Coupling Theory of the Paraelastic and Paraelectric Tunnelling System (XY8).- Phonon Spectroscopy of OH? and Li+ Tunnelling States in Alkali Halides.- Discussion on Magnetic Ions and Molecular Defects.- Co-Operative Magnetism and Critical Phenomena.- Phonons in Co-operative Systems (invited paper).- Ultrasonic Attenuation in Thulium Vanadate at 10 GHz at Liquid Helium Temperatures.- The Thermal Conductivity of Holmium Phosphate, a Strong Ising Antiferromagnet with a Large Hyperfine Interaction.- Thermal Conductivity of PrCl3 from 0.1 to 1K, in Zero and 2.2 Tesla Magnetic Field.- Thermal Conductivity of GdCl3, a Representative Magnetic Insulator.- Spin-Phonon Interactions in Exchange Induced Van Vleck Paramagnets.- Magnetic Field Dependent Thermal Conductivity in FeCl2 and FeBr2.- Attenuation and Dispersion of First Sound Near the Lambda Line of 3He — 4He Mixtures.- Thermal Conductivity of RbCaF3.- Phonon Echoes and Phase Transitions.- Critical Attenuation and Velocity of Surface Waves at Structural Phase Transitions.- Ultrasonic Evidence of Commensurate Domain Structure in Holmium.- Discussion on Co-operative Magnetism and Critical Phenomena.- Free Carriers.- Quantum Oscillation in Transmission of Ballistic Heat Pulse in Bismuth.- Phonon Contribution to the Hall Resistivity in Cadmium.- Phonon Scattering and the Thermopower of Dilute Alloys.- Use of a Phonon Probe to Determine the Magnetic Dependence of the Superconducting Gap.- Temperature Dependence of Electron Mean Free Path in Molybdenum from Ultrasonic Measurements.- Interaction and Scattering of Greater than 2? Phonons with Electrons in Superconducting Sn Films.- Experimental Evidence of Phonon Flux Flow Interaction.- Phonon Induced Structure on Damped Magneto-Absorption of Weakly Polar Semiconductors.- On the Role of Nonelectronic Phonon Processes in Mutual Electron-Phonon Drag.- Phonon Experiments with Weakly Bounded Charge Carriers as Detectors.- Anomaly in the Elastic Properties of Semiconductor under Pressure.- X-Ray Scattering Study of Amplified Phonons in the Presence of Plasmons.- Coupled Plasmon-Phonon Effects in IV-VI Semiconductors.- Anisotropy of Phonon Emission from Hot Electrons in Germanium.- Discussion on Free Carriers.- Localized Holes and Electrons.- Phonon Scattering and Ultrasonic Absorption by Acceptors in Si and Ge (invited paper).- The Effect of Magnetic Field and Uniaxial Stress on the Thermal Conductivity of p-Germanium.- Hole — Phonon Interactions in p-Type InSb by Heat Pulse Experiments.- Ultrasonic Attenuation in p-Type Germanium.- Ultrasonic Attenuation Due to the Neutral Acceptor Indium in Silicon.- Phonon Scattering Due to Deep Acceptors in Semiconductors.- Scattering of Thermal Phonons in P Doped Si.- Discussion on Low Temperature Magnetothermal Conductivity in Lightly Doped Ge(Sb) and Ge(As).- Theory of Ultrasonic Attenuation by Hopping Pairs in n-Ge.- Electron-Phonon Interaction in Lightly and Highly Doped n-Type Germanium.- Discussion on Localized Holes and Electrons.- Anharmonic Effects and Phonon-Phonon Scattering.- Multiphonon Absorption in Alkali Halides.- Raman Scattering Studies of Anharmonicities in Potassium Halides.- Thermal Resistance of Dielectric Crystals at High Temperatures.- Three Phonon Relaxation Times.- Optical-Acoustical Phonon Scatterings in the Lattice Thermal Conductivity of Rock Salt Crystals.- The Thermal Conductivity of Solid Krypton between 2.4 and 39K Determined from Measurements of the Thermal Diffusivity with a Heatwave Method.- Discussion on Anharmonic Effects and Phonon-Phonon Scattering.- Defect Scattering and Phonon Focusing.- The Anisotropy of Phonon Propagation in Some Cubic and Trigonal Crystals.- Interface Effects on Phonon Focusing in Rutile.- Conical Refraction and Acoustic Activity in Quartz.- Accuracy of the Boundary Relaxation Time Approximation.- Scattering of Phonons by Dislocations in Crystals.- Discussion on Defect Scattering and Phonon Focusing.- New Techniques.- High Frequency Phonon Emission from Superconducting Al-Tunnelling Junctions (invited paper).- Time Reversed Ultrasonic Echoes as an Experimental Tool (invited paper).- X-Ray Diffraction Study of Non-Equilibrium Phonon Distributions in GaAs (invited paper).- Terahertz-Phonon Pulse Generation by Laser (invited paper).- Discussion on New Techniques.- List of Delegates.- Author Index.