I am afraid I have to challenge the entry 

Zone America/Indiana/Tell_City -5:47:03 - LMT   1883 Nov 18 12:12:57
                        -6:00   US      C%sT    1946
                        -6:00 Perry     C%sT    1964 Apr 26  2:00
                        -5:00   -       EST     1969
                        -5:00   US      E%sT    1971
                        -5:00   -       EST     2006 Apr  2  2:00
                        -6:00   US      C%sT

It conflicts with Shanks for 1967-169, and therefore I checked newspaper archives.
The Indianapolis News, Friday 27 October 1967 states that Perry County returned to CST.

It went again to EST on 27 April 1969, as documented by the Indianapolis star of Saturday 26 April.

(second screenshot attached)