Carbon Slate Quarry, Slatington, Lehigh County, Pennsylvania, USA

Slate industry - Wikiwand

PICTURES: Tour of the Seven Slopes of Slate quarry in Bangor – The Morning Call

Main entrance to the Hacklebernie Coal mine, Carbon County, PA : r/TheForgottenDepths

Timeline of Labor History in Pennsylvania

Penn Big Bed – The Delta Slate Company

Lehigh County – Ancestor Tracks

Pit and Quarry: The Cement and Slate Landscapes of Pennsylvania

A history lesson on Northern Lehigh's place as major slate producer

MarkerQuest: First School Slate Factory, Slatington, Lehigh County