http://ourlifeinthed.com/the-kentucky-derby-a-brief-history/

http://www.kentuckyderby.com/party/derby-info/derby-history

https://franceshunter.wordpress.com/2010/04/13/meriwether-lewis-clark-jr-and-the-founding-of-churchill-downs/

http://www.oldlouisville.com/postcards/Louisville/LouJockeyClub.jpg