The source files `zic.c' `zdump.c' `tzselect.ksh' `checktab.awk' come from the tzcode1997f package by Arthur David Olsen et.al. The files `africa' `antarctica' `asia' `australasia' `europe' `northamerica' `southamerica' `pacificnew' `etcetera' `factory' `backward' `systemv' `solar87' `solar88' `solar89' `iso3166.tab' `zone.tab' `leapseconds' `yearistype' come from the tzdata1997g package by Arthur David Olsen et.al.