From the record
“The Basalt Cobblestone Quarries District, in Clark County, Washington near Ridgefield, is a 535 acres (2.17 km2) area which was listed on the National Register of Historic Places in 1981. It included seven contributing sites: seven separate quarries.”
Wikipedia article Basalt Cobblestone Quarries District, CC BY-SA 4.0.
One of 45 National Register listings published here for Clark County · listed in 1981 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service




