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Source/Further reading:
This Podcast Will Kill You, episode on Ricin: thispodcastwil...
History of Ricin, and the castor plant: www.ncbi.nlm.n...
CDC Overview: emergency.cdc....
Britannica overview: www.britannica...
PopSci overview: www.popsci.com...
Global Security, ricin as a bioweapon: www.globalsecu...
Mortality rates of ricin types (pdf): dhhr.wv.gov/oe...
Border Cave ricin: www.archaeolog...
Markov assassination: edition.cnn.co...
2003 Ricin letters: archives.fbi.g...
2004 Ricin powder on Capitol Hill: edition.cnn.co...
GQ, the crazy inside story on the 2013 Ricin Letters: www.gq.com/sto...
May 2013 ricin letters: www.nbcnews.co...