1. CALIFORNIA DIVISION OF MINES AND GEOLOGY SPECIAL PUBLICATION 1983 66
2. Bowker A. H. Engineering Statistics 2 (1972).
3. DARRAGH, R.B., BULLETIN OF THE SEISMOGRAPHIC STATIONS 55: 1 (1985).
4. U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1988 1487
5. U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 1987 87-488