https://en.wikipedia.org/wiki/Canonsburg_Opera_House_disaster
https://www.nytimes.com/1911/08/28/archives/theatre-deaths-due-to-narrow-stairs-those-leading-from-canonsburg.html
https://www.canonsburgoperahouse.com/the-morgan-opera-house-project/newspaper-articles/the-daily-notes/the-daily-notes-august-28-1911-died-trying-to-save-others