I. Management Perspective and International Aspects.- Management's Perspective on Underground Gas Storage.- Underground Storage of Natural Gas.- Review of World Wide Storage Projects.- Underground Gas Storage in Denmark - An Overview.- Needs for Underground Storage of Natural Gas in Spain. Prospects, Potentials and Developments: The Serrablo Field.- II Theory and Practice.- Fundamental Equations for Transport Processes in Storage Reservoirs.- Dual-Mechanism Gas Flow Dynamics in Single- and Dual-Porosity Systems.- Geostatistics Applied to Underground Gas Storage.- Deliverability of Natural Gas.- The Development of a Generalized Drawdown Equation for Real Gas Flow Including the Effects of Wellbore Storage and Turbulence.- Inventory Verification Isopore Volumetric Method.- Use of Pulse Test Technique and Reservoir Simulation for Developing Aquifer Storage.- Drilling and Completion Problems Related to Underground Gas Storage Wells.- Storage of Natural Gas in Salt Caverns.- Underground Storage of Liquefied Gases at Low Temperature.- Compressed Air Energy Storage (Peak Shaving Plant Neuenhuntorf).- Computer-Aided Pipeline Facilities and Control Systems.- III Recent Developments.- Mechanism of Gas-Water Flow in Storage Reservoirs.- Two-Phase Flow Simulation.- Mixing in Underground Gas Storage.- Geochemical Fingerprinting: Identification of Storage Gas Using Chemical and Isotopic Analysis.- Establishing a Data Base for Gas Identification.- Numerical Simulation of Miscible Displacement Processes in Gas Storage Reservoirs.- New Techniques in Underground Storage of Natural Gas in France.- IV Case Histories.- Case Histories in Underground Storage.- West Unionville Storage Field A Case History of Gas Migration.- Huntsman and West Engelland Fields A Case History of Gas Migration.-Author Index.