Zodiac Killer letter, July 31st 1969


 * 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)