@misc{indiciaeb7a180e6ebb0,
  title = {The Giles County, Virginia, seismic zone– Seismological results and geological interpretations},
  author = {G. A. Bollinger and R. L. Wheeler},
  year = {1988},
  doi = {10.3133/pp1355},
  url = {https://pubs.usgs.gov/publication/pp1355},
  note = {Source identifier: pp1355}
}