@misc{indiciaeaad1bb13a881,
  title = {A new strategy for developing Vs 30 maps},
  author = {David J. Wald and Leslie McWhirter and Eric Thompson and Amanda S. Hering},
  year = {2011},
  url = {https://pubs.usgs.gov/publication/70005248},
  note = {Source identifier: 70005248}
}