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This publication summarizes recommendations of the NAS/NRC Panel on National, Regional, and Local Seismograph Networks, chaired by B.A. Bolt. The report's nine chapters and seven appendices deal with recommendations to upgrade and reorganize observational seismology in the United States by integrating all seismic stations in the country into a United States Seismograph System (USSS), by constructing a National Digital Seismograph Network (NDSN), and by establishing new lines of authority and responsibility to ensure that development of the new national seismic system proceeds along lines prescribed by the panel.