[1] https://oregontrailcenter.org/dangers

[2] https://www.nps.gov/articles/000/death-on-trails.htm

[3] https://www.cdc.gov/cholera/illness.html#:~:text=Cholera%20is%20an%20acute%20diarrheal,be%20severe%20and%20life%2Dthreatening.

[4] https://www.who.int/news-room/fact-sheets/detail/cholera

[5] https://www.healthline.com/nutrition/castor-oil#3.-May-promote-wound-healing

[6] https://www.medicalnewstoday.com/articles/323692

[7] https://octa-trails.org/articles/life-and-death-on-the-oregon-trail/

[8] https://www.legendsofamerica.com/disease-death-overland-trails/