JB Travel Times Charts and IAPSI 91 travel time curves:

Sir Harold JEFFREYS (English), and Keith Edward BULLEN (New Zealand) =
developed and published the JB seismic travel time tables in 1940.  They =
were updated about 1965.  The JB table was superseded by the IASP91 =
travel time tables by KENNETH & ENGDAHL with the IASP91 tables in 1991.  =
A more recent version of the travel time tables know as AK135 was =
developed in 1995 by KENNETT et al.

Bob Hancock=
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