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Keystone Mine Roof Fall Disaster
Joplin, Jasper County, Missouri
February 26, 1909
No. Killed - 6
Bureau of Mines Investigation Report 
The Jasper News Article (7.3 Mb)
An accident caused by a roof fall in the Keystone mine. Five men were killed outright and another died the next day.
The deceased:
- Harry Ritter
- Gilbert Ritter
- Robert Ritter
- Asa Griffin
- Robert Warren
- Joseph Morrison
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