@misc{indiciaed484304ffd80,
  title = {Gravity of the New Madrid seismic zone; a preliminary study},
  author = {V.E. Langenheim},
  year = {1995},
  doi = {10.3133/pp1538l},
  url = {https://pubs.usgs.gov/publication/pp1538L},
  note = {Source identifier: pp1538L}
}