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The megablast in the City of London last month was the founh to warrant a permanent
place on the Richter scale in just over a year. This bomb and others in London,
Bombay, and the New York World Trade Center all shared Ihree common features:
each megabomb was exploded in a known fmanda"! centre, each left few if any scorch
marks, and the resulting shock blast on every occasion exceed-