Apple Podcasts
Spotify
Google Podcastsseason 2 episode 1. The Zodiac killer
media provided by www.pond5.com
research from the following sites
https://en.wikipedia.org/wiki/Zodiac_Killer
https://projects.sfchronicle.com/2018/zodiac-timeline/
https://www.history.com/news/the-zodiac-killer-a-timeline
http://www.zodiackillerfacts.com/allen.htm