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Source/Further reading:

This Podcast Will Kill You, episode on Ricin: https://thispodcastwillkillyou.com/2020/01/07/episode-41-ricin-a-bad-seed/  

History of Ricin, and the castor plant: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6628454/  

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

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

PopSci overview: https://www.popsci.com/science/article/2013-04/everything-you-need-know-about-ricin-poison-sent-us-senator/  

Global Security, ricin as a bioweapon: https://www.globalsecurity.org/wmd/intro/bio_ricin.htm  

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

Border Cave ricin: https://www.archaeology.org/issues/61-1301/features/267-top-10-2012-border-cave-beeswax-poison  

Markov assassination: https://edition.cnn.com/2003/WORLD/europe/01/07/terror.poison.bulgarian/  

2003 Ricin letters: https://archives.fbi.gov/archives/news/pressrel/press-releases/ricin-letter  

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

GQ, the crazy inside story on the 2013 Ricin Letters: https://www.gq.com/story/paul-kevin-curtis-elvis-impersonator-ricin-assassinations  

May 2013 ricin letters: https://www.nbcnews.com/news/us-news/woman-who-mailed-ricin-letters-obama-sentenced-18-years-n157531