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Source/Further reading:

This Podcast Will Kill You, episode on Ricin: https://thispodcastwillkillyou.com/20...

History of Ricin, and the castor plant: https://www.ncbi.nlm.nih.gov/pmc/arti...

CDC Overview: https://emergency.cdc.gov/agent/ricin...

Britannica overview: https://www.britannica.com/science/ri...

PopSci overview: https://www.popsci.com/science/articl...

Global Security, ricin as a bioweapon: https://www.globalsecurity.org/wmd/in...

Mortality rates of ricin types (pdf): https://dhhr.wv.gov/oeps/disease/AtoZ...

Border Cave ricin: https://www.archaeology.org/issues/61...

Markov assassination: https://edition.cnn.com/2003/WORLD/eu...

2003 Ricin letters: https://archives.fbi.gov/archives/new...

2004 Ricin powder on Capitol Hill: https://edition.cnn.com/2004/US/02/03...

GQ, the crazy inside story on the 2013 Ricin Letters: https://www.gq.com/story/paulkevinc...

May 2013 ricin letters: https://www.nbcnews.com/news/usnews/...