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REFERENCES National Research Council (l960) Specifications for a World-Wide Network of Standardized Seismographs, Committee on Siesmological Stations. Washington, D.C.: National Academy of Sciences. National Research Council (l977a) Global Earthquake Monitoring: Its Uses, Potentials, and Support Requirements, Panel on Seismograph Networks, Committee on Siesmology. Washington, D.C.: National Academy of Sciences. National Research Council (l977b) Trends and Opportunities in Seismology, Committee on Seismology, Washington, D.C.: National Academy of Sciences. National Research Council (l980) U.S. Earthquake Observatories: Recommendations for a New National Network, Panel on National, Regional and Local Seismograph Networks, Committee on Seismology. Washington, D.C.: National Academy of Sciences. National Research Council (in preparation) Data Problems in Seismology, Panel on Data Problems in Seismology, Committee on Seismology. National Science Foundation (l976) Earthquake Prediction and Hazard Mitigation: Options for USGS and NSF Programs, NSF Publication 76-49. Washington, D.C. Oliver, J., and L. Murphy (l97l) WWSSN: Seismology's global network at observing stations, Science l74:254-26l. Panel on Seismic Improvement, L.V. Berkner, Chairman (l959) The Need for Fundamental Research in Seismology, panel established by President Eisenhower's Special Assistant for Science and Technology, Department of State, Washington, D.C. 2l4 pp. 30