IRIS 1984, 9쪽. Incorporated Research Institutions for Seismology (December 1984), 〈Appendix 1A〉(PDF), 《Science Plan for A New Global Seismographic Network》, LCCN84-82089.
IRIS 1984, 9쪽. Incorporated Research Institutions for Seismology (December 1984), 〈Appendix 1A〉(PDF), 《Science Plan for A New Global Seismographic Network》, LCCN84-82089.