- Zodiac Killer letter, San Francisco Chronicle, July 31st 1969
- Zodiac Killer letter, Vallejo Times-Herald, July 31st 1969
- Zodiac Killer letter, San Francisco Examiner, July 31st 1969
Translation of the cipher:
- Harden worksheet, worksheet with the message deciphered by Donald and Bettye Harden (1969)
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