@book{31475,
	author = {Dart, R. L. and United States},
	title = {Puerto Rico seismic network data report of earthquakes located by the programs HYPO71 and HYPOELLIPSE, July 1, 1975-December 31, 1977},
	publisher = {Free on Application to Branch of Distribution, U.S. Geological Survey},
	year = {1980.},
	series = {Geological Survey circular},
	address = {Arlington, Va. (1200 South Eads Street, Arlington, Va. 22202}
}