Episode 34 The July 31st 1969 LettersIn this episode, Mike and Rich examine the Zodiac's July 31, 1969 communications for clues about the killer, his inspiration for the letters, and his M.O.Follow Zodiac Speaking on Facebook at:https://www.facebook.com/Zodiac-Speaking-Podcast-105911481547105or on Twitter at:https://twitter.com/PodcastZodiacVisit Mike Morford's Zodiac site at:https://zodiackiller.net/And Richard Grinell's Zodiac site at:https://www.zodiacciphers.com/