@misc{indiciaed1786c433e64,
  title = {Vs30 and spectral response from collocated shallow, active- and passive-source Vs data at 27 sites in Puerto Rico},
  author = {Jack K. Odum and William J. Stephenson and Robert A. Williams and Christa von Hillebrandt-Andrade},
  year = {2013},
  doi = {10.1785/0120120349},
  url = {https://pubs.usgs.gov/publication/70045061},
  note = {Source identifier: 70045061}
}