The 1869 Avondale Mine disaster was a pivotal point in labor history. It inspired some of the first labor unions and workplace safety regulations.

Entrance to strip mine, Avondale PA
View of Avondale valley, the site of an 1869 disaster in which 110 miners were killed by an underground fire. The disaster sparked some of the first safety regulations for coal mines and caused early labor unions to gain strength. 4×5 B&W Film