Glass Sand Manufacturers
| U.S. Silica Company (Berkeley Springs, WV)
Manufacturer |
| Castle Sands Co (New Castle, VA) |
| El Toro Materials Co (Lake Forest, CA) |
| Ortona Sand Co Inc (Moore Haven, FL) |
| Us Silica (Hurtsboro, AL) |
| Us Silica Co (Mapleton Depot, PA) |
| Us Silica Co (Dubberly, LA) |
