Geological Survey (U.S.)\nNational Earthquake Information Center. (1967). Earthquake Information Bulletin. National Earthquake Information Center.
Chicago-viite (17. p.)Geological Survey (U.S.)\nNational Earthquake Information Center. Earthquake Information Bulletin. Rockville, Md: National Earthquake Information Center, 1967.
MLA-viite (8. p.)Geological Survey (U.S.)\nNational Earthquake Information Center. Earthquake Information Bulletin. National Earthquake Information Center, 1967.
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