Quarries of the Hummelstown Brownstone Company - Credit: Wikimedia Commons
Quarries of the Hummelstown Brownstone Company - Credit: Wikimedia Commons
From 1863 to 1929, the Hummelstown Brownstone Company owned and operated quarries in the Hummelstown, Pennsylvania area which produced Hummelstown brownstone, once widely used as a building stone throughout the US. The quarries of the Hummelstown Brownstone Company are listed on the National Register of Historic Places. Note: This includes Read more on Wikipedia
Source: en.wikipedia.org