Comptes Rendus Des Séances
International Association of Seismology and Physics of the Earth's Interior
12, 1970 (north of Bollnas), Apr. 20, 1971 (northeast of Umea), July 28, 1971 ( Medelpad-Halsingland). BIBLIOGRAPHY 1. H.N. Al-Sadi, M. Bath, A.K. Ibrahim, O. Kulhanek and A. Sayman: Spectral analysis of seismograph records. Seismolog.