Overview and Historical PerspectiveMolecular Structures and Similarities to IceKinetics of Hydrate FormationFundamental Phase Equilibrium for Natural Gas HydratesA Statistical Thermodynamic Approach to Hydrate Phase EquilibriaExperimental Methods and Measurements of Hydrate PropertiesHydrates in the EarthHydrates in Natural Gas Production, Transportation, and ProcessingAppendix A: Fugacity Coefficient, Enthalpy, and Entropy Changes Using an Equation-of-State and Expansion ProgramAppendix B: User's Guide for CSMHYD Hydrate ProgramReferences