The source files
	`zic.c'
	`zdump.c'
	`tzselect.ksh'
	`checktab.awk'
come from the tzcode1997a 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 tzdata1997a package by Arthur David Olsen et.al.