A Harper's Weekly artist documented work in an anthracite mine in Pennsylvania in 1869.
As anthracite mines became increasingly electrified, mine mules began to disappear from the Coal Region.
Coal Region photographer A.M. Allen captured images of a colliery near Mahanoy City in the years after the Civil War.
A digital archive allows researchers to view hundreds of photographs taken in the Coal Region in the 19th century.
Film from the early 20th century shows collieries above Tower City, Pennsylvania in full operation.
A brief look at the history of Ashland's Pioneer Colliery in the 19th century.
"Children of the mine are they, born in the shadow of the culm heaps with the roar of the breakers ever in their ears, with mines beneath their feet."
A writer at the Lykens Register opined in September 1900 about rising inequality in the Coal Region.
A newspaper correspondent details life in Lykens and Wiconisco in the months after the end of the Great War.
In June 1867, a thunderstorm passed through Wiconisco, Pennsylvania and electrocuted miners deep within one of the town's coal mines.